{"id":284035,"date":"2020-08-25T21:29:46","date_gmt":"2020-08-25T14:29:46","guid":{"rendered":"https:\/\/quipperhome.wpcomstaging.com\/?p=284035"},"modified":"2023-02-07T15:13:08","modified_gmt":"2023-02-07T08:13:08","slug":"gelombang-elektromagnetik-fisika-kelas-12","status":"publish","type":"post","link":"https:\/\/quipperhome.wpcomstaging.com\/mapel\/fisika\/gelombang-elektromagnetik-fisika-kelas-12\/","title":{"rendered":"Gelombang Elektromagnetik &#8211; Fisika Kelas 12"},"content":{"rendered":"<div id=\"attachment_284047\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img fetchpriority=\"high\" decoding=\"async\" aria-describedby=\"caption-attachment-284047\" class=\"size-full wp-image-284047\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-d.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-d.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-d-768x512.png 768w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-d-585x390.png?crop=1 585w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-d-263x175.png?crop=1 263w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-d-300x200.png 300w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-284047\" class=\"wp-caption-text\">Foto: freepik.com<\/p><\/div>\n<p><span style=\"font-weight: 400;\">Hai Quipperian, bagaimana kabarnya? Semoga selalu sehat dan tetap semangat, ya.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Kemajuan teknologi mampu membawa manusia terbang ke luar angkasa. Lalu, bagaimana cara mereka berkomunikasi saat berada di luar angkasa? Bukannya di sana hampa udara ya?&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Nah, mungkin itulah yang sering menjadi pertanyaan Quipperian. Para astronot memanfaatkan gelombang radio untuk berkomunikasi, baik sesama astronot maupun dengan petugas yang ada di Bumi.&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tahukah kamu jika gelombang radio termasuk dalam gelombang elektromagnetik, <\/span><em><span style=\"font-weight: 400;\">lho<\/span><\/em><span style=\"font-weight: 400;\">. Apa itu gelombang elektromagnetik? Untuk melihat pembahasannya, <\/span><em><span style=\"font-weight: 400;\">stay<\/span><\/em><span style=\"font-weight: 400;\"> terus bareng Quipper Blog, ya.<\/span><\/p>\n<h2><strong>Pengertian Gelombang Elektromagnetik<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Gelombang elektromagnetik adalah gelombang yang tidak membutuhkan medium untuk merambat. Artinya, gelombang elektromagnetik bisa merambat meskipun dalam ruang hampa seperti di luar angkasa.&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Gelombang elektromagnetik dibentuk oleh medan magnet dan medan listrik yang saling merambat tegak lurus. Sumber penghasil gelombang elektromagnetik berbeda-beda. Beberapa di antaranya dihasilkan oleh nuklir atau atomik yang di dalamnya memuat fisika kuantum. Perhatikan ilustrasi gelombang elektromagnetik berikut ini.<\/span><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-284044\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-1.png\" alt=\"\" width=\"560\" height=\"210\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-1.png 560w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-1-300x113.png 300w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Untuk kelajuan gelombang elektromagnetik bisa ditentukan dengan persamaan berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img decoding=\"async\" class=\"alignnone size-full wp-image-284043\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-2.png\" alt=\"\" width=\"120\" height=\"79\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Keterangan:<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">c<\/span><\/em><span style=\"font-weight: 400;\"> = kelajuan gelombang elektromagnetik (m\/s);<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">E<\/span><\/em><span style=\"font-weight: 400;\"> = besar medan listrik (N\/C); dan<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">B<\/span><\/em><span style=\"font-weight: 400;\"> = besar medan magnet (T).<\/span><\/p>\n<h2><strong>Spektrum Gelombang Elektromagnetik<\/strong><\/h2>\n<div id=\"attachment_284050\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-284050\" class=\"size-full wp-image-284050\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-a.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-a.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-a-300x200.png 300w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-a-768x512.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-284050\" class=\"wp-caption-text\">Foto: pexels.com<\/p><\/div>\n<p><span style=\"font-weight: 400;\">Di awal pembahasan materi ini, kamu sudah dikenalkan dengan gelombang radio yang biasa digunakan oleh astronot untuk berkomunikasi. Ternyata, gelombang elektromagnetik itu tidak hanya gelombang radio saja. Melainkan ada 7 spektrum yang wajib kamu hafalkan, yaitu sebagai berikut.<\/span><\/p>\n<h3><strong>1. Gelombang radio<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Gelombang radio merupakan spektrum gelombang elektromagnetik yang memiliki panjang gelombang terbesar dan frekuensi terkecil. Gelombang ini dihasilkan oleh elektron pada kawat penghantar. Elektron tersebut nantinya akan menghasilkan arus bolak-balik pada kawat. Gelombang radio dipancarkan melalui <\/span><em><span style=\"font-weight: 400;\">transmitter<\/span><\/em><span style=\"font-weight: 400;\"> (antena pemancar) dan diterima oleh <\/span><em><span style=\"font-weight: 400;\">receiver<\/span><\/em><span style=\"font-weight: 400;\"> (antena penerima).<\/span><\/p>\n<h3><strong>2. Gelombang mikro<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Gelombang mikro merupakan spektrum gelombang elektromagnetik yang memiliki frekuensi terkecil kedua setelah gelombang radio. Frekuensi gelombang mikro adalah 10<\/span><sup><span style=\"font-weight: 400;\">10<\/span><\/sup><span style=\"font-weight: 400;\"> Hz dengan panjang gelombang 3 mm. gelombang mikro biasa dimanfaatkan untuk kepentingan deteksi bawah laut menggunakan radar, membantu pendaratan pesawat, dan sebagainya.<\/span><\/p>\n<h3><strong>3. Sinar inframerah<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Sinar inframerah memiliki frekuensi lebih besar daripada gelombang mikro. Frekuensi sinar inframerah berada di rentang 10<\/span><sup><span style=\"font-weight: 400;\">11<\/span><\/sup><span style=\"font-weight: 400;\"> Hz \u2013 10<\/span><sup><span style=\"font-weight: 400;\">14<\/span><\/sup><span style=\"font-weight: 400;\"> Hz. Artinya, panjang gelombang sinar inframerah lebih kecil daripada gelombang radio dan gelombang mikro.&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Sinar inframerah banyak diaplikasikan dalam kehidupan sehari-hari, misalnya di bidang kedokteran untuk terapi saraf dan penyembuhan penyakit encok, di bidang militer untuk melihat di tempat gelap atau berkabut, di bidang elektronika untuk <\/span><em><span style=\"font-weight: 400;\">remote control<\/span><\/em><span style=\"font-weight: 400;\">, dan masih banyak lainnya.<\/span><\/p>\n<h3><strong>4. Cahaya tampak<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Jika di spektrum sebelumnya kamu tidak bisa melihat wujud gelombangnya, tidak demikian dengan cahaya tampak. Warna-warna merah, jingga, kuning, hijau, biru, nila, dan ungu merupakan bentuk spektrum cahaya tampak. Cahaya tampak memiliki frekuensi sekitar 10<\/span><sup><span style=\"font-weight: 400;\">15<\/span><\/sup><span style=\"font-weight: 400;\"> Hz dengan panjang gelombang 400 nm \u2013 800 nm.&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Panjang gelombang terpendek dari cahaya tampak dimiliki oleh cahaya ungu. Artinya, cahaya ungu memiliki frekuensi dan energi terbesar dibandingkan warna lainnya. Sementara itu, panjang gelombang terpanjang dimiliki oleh cahaya merah. Aplikasi cahaya tampak bisa kamu lihat pada laser.<\/span><\/p>\n<h3><strong>5. Sinar ultraviolet<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Sinar ultraviolet atau biasa disingkat sinar UV merupakan spektrum gelombang elektromagnetik yang memiliki frekuensi 10<\/span><sup><span style=\"font-weight: 400;\">15<\/span><\/sup><span style=\"font-weight: 400;\"> \u2013 10<\/span><sup><span style=\"font-weight: 400;\">16<\/span><\/sup><span style=\"font-weight: 400;\"> Hz. Panjang gelombang sinar UV adalah 10 \u2013 100 nm. Sinar UV dihasilkan oleh radiasi sinar Matahari.<\/span><\/p>\n<h3><strong>6. Sinar X<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Sinar X merupakan spektrum gelombang elektromagnetik dengan frekuensi atau energi terbesar kedua setelah sinar gamma. Frekuensi sinar X berada di kisaran 10<\/span><sup><span style=\"font-weight: 400;\">16<\/span><\/sup><span style=\"font-weight: 400;\"> \u2013 10<\/span><sup><span style=\"font-weight: 400;\">20 <\/span><\/sup><span style=\"font-weight: 400;\">Hz. Sinar ini ditemukan oleh Wilhelm Rontgen. Itulah mengapa sinar X juga biasa disebut sinar Rontgen. Sinar X dihasilkan oleh aktivitas elektron berkecepatan tinggi yang menumbuk logam. Tumbukan antara elektron dan logam disertai pelepasan energi dalam bentuk radiasi sinar X. Oleh karena energinya sangat besar, tak heran jika sinar X mampu menembus logam dan tulang manusia.<\/span><\/p>\n<h3><strong>7. Sinar gamma<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Sinar gamma merupakan spektrum gelombang elektromagnetik dengan energi tertinggi. Hal itu dikarenakan sinar gamma memiliki frekuensi tertinggi di antara spektrum gelombang elektromagnetik lainnya, yaitu 10<\/span><sup><span style=\"font-weight: 400;\">20<\/span><\/sup><span style=\"font-weight: 400;\"> \u2013 10<\/span><sup><span style=\"font-weight: 400;\">25<\/span><\/sup><span style=\"font-weight: 400;\"> Hz. Mengingat energi sinar gamma sangat besar, tak heran jika sinar ini bisa menembus logam beberapa sentimeter. Sinar gamma dihasilkan oleh aktivitas radioaktif atau atom-atom yang tidak stabil di reaksi inti.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Untuk memudahkan kamu dalam menghfal urutan spektrum gelombang elektromagnetik, perhatikan SUPER \u201cSolusi Quipper\u201d berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284042\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-3.png\" alt=\"\" width=\"490\" height=\"200\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-3.png 490w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-3-300x122.png 300w\" sizes=\"(max-width: 490px) 100vw, 490px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Untuk rentang frekuensinya, bisa Quipperian lihat di bagan berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284041\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-4.png\" alt=\"\" width=\"586\" height=\"263\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-4.png 586w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-4-300x135.png 300w\" sizes=\"(max-width: 586px) 100vw, 586px\" \/><\/p>\n<h2><strong>Sifat-Sifat Gelombang Elektromagnetik<\/strong><\/h2>\n<div id=\"attachment_284049\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-284049\" class=\"size-full wp-image-284049\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-b.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-b.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-b-300x200.png 300w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-b-768x512.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-284049\" class=\"wp-caption-text\">Foto: pexels.com<\/p><\/div>\n<p><span style=\"font-weight: 400;\">Adapun sifat gelombang elektromagnetik adalah sebagai berikut.<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Memiliki kecepatan konstan di ruang hampa, yaitu sebesar 3 <\/span><span style=\"font-weight: 400;\">\u00d7<\/span><span style=\"font-weight: 400;\"> 10<\/span><sup><span style=\"font-weight: 400;\">8<\/span><\/sup><span style=\"font-weight: 400;\"> m\/s.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Tidak dipengaruhi oleh medan listrik maupun medan magnet karena tidak bermuatan listrik.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Termasuk gelombang transversal.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Energinya bergantung pada besarnya frekuensi. Hal itu didasarkan pada persamaan Planck berikut.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284040\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-5.png\" alt=\"\" width=\"125\" height=\"76\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Keterangan:<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">E<\/span><\/em><span style=\"font-weight: 400;\"> = energi radiasi (J);<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">h<\/span><\/em><span style=\"font-weight: 400;\"> = konstanta Planck = 6,6 <\/span><span style=\"font-weight: 400;\">\u00d7<\/span><span style=\"font-weight: 400;\"> 10<\/span><span style=\"font-weight: 400;\">34<\/span><span style=\"font-weight: 400;\"> Js;<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">f<\/span><\/em><span style=\"font-weight: 400;\"> = frekuensi (Hz);<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">c<\/span><\/em><span style=\"font-weight: 400;\"> = kelajuan cahaya = 3 <\/span><span style=\"font-weight: 400;\">\u00d7<\/span><span style=\"font-weight: 400;\"> 10<\/span><sup><span style=\"font-weight: 400;\">8<\/span><\/sup><span style=\"font-weight: 400;\"> m\/s; dan<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u03bb = panjang gelombang (m).<\/span><\/p>\n<h2><strong>Manfaat Gelombang Elektromagnetik<\/strong><\/h2>\n<div id=\"attachment_284048\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-284048\" class=\"size-full wp-image-284048\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-c.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-c.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-c-300x200.png 300w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-c-768x512.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-284048\" class=\"wp-caption-text\">Foto: pexels.com<\/p><\/div>\n<p><span style=\"font-weight: 400;\">Gelombang elektromagnetik memiliki manfaat yang sangat besar dalam kehidupan. Kira-kira, apa saja ya manfaatnya? Apakah Quipperian tahu? Nah, daripada penasaran, inilah manfaat gelombang elektromagnetik.<\/span><\/p>\n<h3><strong>1. Gelombang radio<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Gelombang yang digunakan sebagai gelombang pembawa audio (suara). Biasanya kamu kenal sebagai radio.<\/span><\/p>\n<h3><strong>2. Gelombang mikro<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Adapun manfaat gelombang mikro adalah sebagai berikut.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Pemanas makanan (<\/span><em><span style=\"font-weight: 400;\">microwave<\/span><\/em><span style=\"font-weight: 400;\">).<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Untuk komunikasi pada teknologi RADAR.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Menganalisis struktur atomik dan molekul.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Memandu pendaratan pesawat.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Mendeteksi keberadaan suatu objek.<\/span><\/li>\n<\/ul>\n<h3><strong>3. Sinar inframerah<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Adapun manfaat sinar inframerah adalah sebagai berikut.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Untuk terapi fisik, misalnya menyembuhkan penyakit cacar dan encok.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Untuk fotografi pemetaan sumber daya alam.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Digunakan pada <\/span><em><span style=\"font-weight: 400;\">remote control<\/span><\/em><span style=\"font-weight: 400;\">.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Mengeringkan cat kendaraan dengan cepat pada industri otomotif.<\/span><\/li>\n<\/ul>\n<h3><strong>4. Cahaya tampak<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Untuk cahaya tampak, memiliki manfaat berikut ini.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Sinar laser digunakan pada bidang telekomunikasi untuk menyalurkan suara, gambar, atau sinyal melalui serat optik.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Sinar laser digunakan di bidang kedokteran sebagai alat untuk mendiagnosis penyakit.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Di bidang industri, sinar laser digunakan untuk mengelas dan memotong lempengan baja.<\/span><\/li>\n<\/ul>\n<h3><strong>5. Sinar ultraviolet<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Sinar ultraviolet bisa dimanfaatkan untuk hal-hal berikut.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Proses fotosintesis atau asimilasi pada tumbuhan.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Pembentukan vitamin D.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Membunuh kuman penyakit.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Mensterilkan ruangan.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Memeriksa keaslian tanda tangan di dunia perbankan.<\/span><\/li>\n<\/ul>\n<h3><strong>6. Sinar X<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Sinar X bisa dimanfaatkan untuk hal-hal berikut.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Memotret organ-organ dalam tubuh seperti tulang, jantung, dan paru-paru.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Menganalisis struktur bahan atau kristal.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Mendeteksi keretakan atau cacat pada logam.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Memeriksa barang-barang di bandara.<\/span><\/li>\n<\/ul>\n<h3><strong>7. Sinar gamma<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Sinar gamma bermanfaat untuk hal-hal berikut.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Terapi kanker.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Sterilisasi peralatan rumah sakit.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Sterilisasi makanan kemasan.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Pembuatan varietas tanaman unggul tahan hama.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Mengurangi populasi hama.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Nah, agar kamu lebih paham, simak contoh soal berikut ini.<\/span><\/p>\n<h2><strong>Contoh Soal 1<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Perhatikan gambar berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284039\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-6.png\" alt=\"\" width=\"424\" height=\"158\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-6.png 424w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-6-300x112.png 300w\" sizes=\"(max-width: 424px) 100vw, 424px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Gelombang elektromagnetik yang bermanfaat untuk memotret organ dalam tubuh ditunjukkan oleh nomor berapa?<\/span><\/p>\n<p><strong>Pembahasan:<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Perhatikan kembali gambar berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284038\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-7.png\" alt=\"\" width=\"439\" height=\"161\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-7.png 439w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-7-300x110.png 300w\" sizes=\"(max-width: 439px) 100vw, 439px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Gambar tersebut menunjukkan spektrum gelombang elektromagnetik dengan panjang gelombang terpendek ke terpanjang atau dari frekuensi tertinggi ke terendah. Artinya, urutan spektrum berdasarkan gambar di atas adalah sinar gamma, sinar X, sinar ultraviolet, cahaya tampak, sinar inframerah, gelombang mikro, dan gelombang radio.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Kamu harus ingat bahwa gelombang elektromagnetik yang bisa digunakan untuk memotret organ dalam tubuh adalah sinar X. Sinar X ditunjukkan oleh nomor 2.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, gelombang elektromagnetik yang digunakan untuk memotret organ dalam tubuh ditunjukkan oleh nomor 2.<\/span><\/p>\n<h2><strong>Contoh Soal 2<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Tentukan besarnya energi yang terkandung dalam suatu sinar dengan panjang gelombang 132 nm!<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pembahasan:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Diketahui:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u03bb = <\/span><span style=\"font-weight: 400;\">132 nm<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">c<\/span><\/em><span style=\"font-weight: 400;\"> = 3 <\/span><span style=\"font-weight: 400;\">\u00d7<\/span><span style=\"font-weight: 400;\"> 10<\/span><sup><span style=\"font-weight: 400;\">8<\/span><\/sup><span style=\"font-weight: 400;\"> m\/s<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">h<\/span><\/em><span style=\"font-weight: 400;\"> = 6,6 <\/span><span style=\"font-weight: 400;\">\u00d7<\/span><span style=\"font-weight: 400;\"> 10<\/span><sup><span style=\"font-weight: 400;\">34<\/span><\/sup><span style=\"font-weight: 400;\"> Js<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ditanya: <\/span><em><span style=\"font-weight: 400;\">E<\/span><\/em><span style=\"font-weight: 400;\"> =\u2026?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pembahasan:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Gunakan persamaan Planck berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284037\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-8.png\" alt=\"\" width=\"216\" height=\"142\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, energi yang terkandung dalam sinar tersebut adalah 1,5 <\/span><span style=\"font-weight: 400;\">\u00d7<\/span><span style=\"font-weight: 400;\"> 10<\/span><sup><span style=\"font-weight: 400;\">-18<\/span><\/sup><span style=\"font-weight: 400;\"> J.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Itulah pembahasan Quipper Blog tentang gelombang elektromagnetik. Semoga bermanfaat buat Quipperian. Jika Quipperian ingin melihat pembahasan materi ini lebih detail, silakan gabung bersama <a href=\"https:\/\/subscribe.quipper.com\/signup\/id\"><strong>Quipper Video<\/strong><\/a>. Salam Quipper!<\/span><\/p>\n<p><span style=\"font-weight: 400;\">[spoiler title=SUMBER]<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"><a href=\"https:\/\/d14fikpiqfsi71.cloudfront.net\/media\/W1siZiIsIjIwMTkvMTAvMDkvMTAvMTEvMjQvNjRhYTZhN2YtZjhhOS00OTYzLWI1OTEtMWFjNTJhNmI4ZWJjL1RleHRib29rX0cxMiUyMEZpc2lrYSUyMFNlc2klMjA5JTIwUmFkaWFzaSUyMEVsZWt0cm9tYWduZXRpay5wZGYiXV0.pdf?sha=125b195dd3e9c9c5\" rel=\"nofollow\">https:\/\/d14fikpiqfsi71.cloudfront.net\/media\/W1siZiIsIjIwMTkvMTAvMDkvMTAvMTEvMjQvNjRhYTZhN2YtZjhhOS00OTYzLWI1OTEtMWFjNTJhNmI4ZWJjL1RleHRib29rX0cxMiUyMEZpc2lrYSUyMFNlc2klMjA5JTIwUmFkaWFzaSUyMEVsZWt0cm9tYWduZXRpay5wZGYiXV0.pdf?sha=125b195dd3e9c9c5<\/a><\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"><a href=\"https:\/\/learn.quipper.com\/%5B\/spoiler%5D\" rel=\"nofollow\">https:\/\/learn.quipper.com\/%5B\/spoiler%5D<\/a><\/span><\/li>\n<\/ul>\n<p><strong>Penulis: Eka Viandari<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hai Quipperian, bagaimana kabarnya? Semoga selalu sehat dan tetap semangat, ya. Kemajuan teknologi mampu membawa manusia terbang ke luar angkasa. Lalu, bagaimana cara mereka&hellip;<\/p>\n","protected":false},"author":99400369,"featured_media":284047,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[679384877,679384888],"tags":[],"ppma_author":[679386827,679386838],"class_list":["post-284035","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fisika","category-mapel"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gelombang Elektromagnetik - Fisika Kelas 12 - Quipper Blog<\/title>\n<meta name=\"description\" content=\"Quipperian, yuk pelajari materi Gelombang Elektromagnetik sekaligus contoh soalnya di artikel berikut ini!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/quipperhome.wpcomstaging.com\/mapel\/fisika\/gelombang-elektromagnetik-fisika-kelas-12\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Gelombang Elektromagnetik - Fisika Kelas 12 - Quipper Blog\" \/>\n<meta property=\"og:description\" content=\"Quipperian, yuk pelajari materi Gelombang Elektromagnetik sekaligus contoh soalnya di artikel berikut ini!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/quipperhome.wpcomstaging.com\/mapel\/fisika\/gelombang-elektromagnetik-fisika-kelas-12\/\" \/>\n<meta property=\"og:site_name\" content=\"Quipper Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/QuipperVideoID\/\" \/>\n<meta property=\"article:published_time\" content=\"2020-08-25T14:29:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-02-07T08:13:08+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/08\/Gelombang-Elektromagnetik-d.png\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"533\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"sereliciouz, Cecep Saeful Mukti, S.Pd.\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@quipper_id\" \/>\n<meta name=\"twitter:site\" content=\"@quipper_id\" \/>\n<meta name=\"twitter:label1\" content=\"Ditulis oleh\" \/>\n\t<meta name=\"twitter:data1\" content=\"sereliciouz\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimasi waktu membaca\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 menit\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/quipperhome.wpcomstaging.com\\\/mapel\\\/fisika\\\/gelombang-elektromagnetik-fisika-kelas-12\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/quipperhome.wpcomstaging.com\\\/mapel\\\/fisika\\\/gelombang-elektromagnetik-fisika-kelas-12\\\/\"},\"author\":{\"name\":\"sereliciouz\",\"@id\":\"https:\\\/\\\/quipperhome.wpcomstaging.com\\\/#\\\/schema\\\/person\\\/b08224c7b72a87b156db30c3b032083b\"},\"headline\":\"Gelombang Elektromagnetik &#8211; 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