{"id":315760,"date":"2023-05-13T15:00:00","date_gmt":"2023-05-13T08:00:00","guid":{"rendered":"https:\/\/quipperhome.wpcomstaging.com\/?p=315760"},"modified":"2023-05-10T15:22:05","modified_gmt":"2023-05-10T08:22:05","slug":"efek-fotolistrik","status":"publish","type":"post","link":"https:\/\/quipperhome.wpcomstaging.com\/mapel\/fisika\/efek-fotolistrik\/","title":{"rendered":"Materi Efek Fotolistrik: Sejarah, Rumus dan Contoh Soalnya"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1280\" height=\"780\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/Materi-Efek-Fotolistrik-Sejarah-Rumus-dan-Contoh-Soalnya.webp\" alt=\"Materi Efek Fotolistrik Sejarah, Rumus dan Contoh Soalnya\" class=\"wp-image-315785\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/Materi-Efek-Fotolistrik-Sejarah-Rumus-dan-Contoh-Soalnya.webp 1280w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/Materi-Efek-Fotolistrik-Sejarah-Rumus-dan-Contoh-Soalnya-768x468.webp 768w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/Materi-Efek-Fotolistrik-Sejarah-Rumus-dan-Contoh-Soalnya-1200x731.webp 1200w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/Materi-Efek-Fotolistrik-Sejarah-Rumus-dan-Contoh-Soalnya-1170x713.webp 1170w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Hai Quipperian, siapa sih yang tidak kenal ilmuwan Fisika kenamaan Albert Einstein? Einstein merupakan salah satu tokoh peletak dasar Fisika Kuantum.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kemunculan Fisika Kuantum ini dilatarbelakangi oleh banyaknya fenomena yang tidak bisa dijelaskan dengan Fisika Klasik era Newton.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Salah satu penemuan Einstein yang cukup fenomenal adalah adanya efek fotolistrik pada saat sebuah logam ditembak dengan gelombang elektromagnetik.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Memangnya, apa yang dimaksud dengan efek fotolistrik itu? Daripada penasaran, yuk simak selengkapnya!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pengertian Efek Fotolistrik<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Efek fotolistrik adalah gejala terlepasnya elektron pada permukaan logam karena menyerap radiasi gelombang elektromagnetik<\/strong>. Adapun ilustrasi efek fotolistrik bisa kamu lihat pada gambar berikut.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/ilustrasi-efek-fotolistrik.webp\" alt=\"\" class=\"wp-image-315763\" width=\"400\" height=\"400\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/ilustrasi-efek-fotolistrik.webp 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/ilustrasi-efek-fotolistrik-768x768.webp 768w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/ilustrasi-efek-fotolistrik-400x400.webp?crop=1 400w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/ilustrasi-efek-fotolistrik-200x200.webp?crop=1 200w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/ilustrasi-efek-fotolistrik-585x585.webp?crop=1 585w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/figure>\n<\/div>\n\n\n<p style=\"text-align:center;font-size:12px;\"><a rel=\"nofollow\" href=\"https:\/\/id.wikipedia.org\/wiki\/Efek_fotolistrik\">Efek fotolistrik<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dari gambar di atas terlihat bahwa, saat atom-atom pada logam menyerap radiasi foton dari gelombang elektromagnetik, sebagian elektron di dalam atom akan terlepas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Semakin besar intensitas penyinarannya, semakin banyak elektron yang akan terlepas. Nah, ternyata elektron-elektron yang terlepas dari permukaan logam ini bisa menghasilkan arus listrik.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hal itu bisa dibuktikan dengan menghubungkannya pada sistem rangkaian listrik tertutup. Semakin besar intensitas radiasi fotonnya, semakin besar kuat arus yang terukur pada amperemeter<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sejarah Penemuan Efek Fotolistrik<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sejarah penemuan efek fotolistrik diawali oleh penelitian seorang Fisikawan Jerman, yaitu Heinrich Hertz dengan set up penelitian seperti berikut.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/Sejarah-Penemuan-Efek-Fotolistrik.webp\" alt=\"Sejarah Penemuan Efek Fotolistrik\n\" class=\"wp-image-315769\" width=\"564\" height=\"234\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/Sejarah-Penemuan-Efek-Fotolistrik.webp 1128w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/Sejarah-Penemuan-Efek-Fotolistrik-768x318.webp 768w\" sizes=\"(max-width: 564px) 100vw, 564px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Kala itu, Hertz mengamati bahwa ketika elektroda logam dikenai radiasi sinar ultraviolet, jumlah elektron di dalamnya mengalami penurunan secara signifikan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Namun, Hertz belum bisa menjelaskan secara rinci tentang penyebab terlepasnya elektron pada elektroda logam tersebut.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Barulah pada tahun 1902, ilmuwan Fisika lain, yaitu Lenard mengungkapnya beberapa fakta terkait fenomena terlepasnya elektron dari elektroda logam. Adapun fakta-fakta yang diungkapnya Lenard adalah sebagai berikut.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Elektron akan terlepas dari logam jika dikenai foton yang frekuensinya di atas ambang batas frekuensi elektron tersebut. Berapapun intensitas radiasinya, jika frekuensinya lebih besar dari frekuensi ambang batas elektron, maka elektron akan terlepas. Sebaliknya, berapapun intensitas radiasinya, jika frekuensi fotonnya lebih kecil dari frekuensi ambang batang elektron, maka elektron tidak akan terlepas.<\/li>\n\n\n\n<li>Besar kecilnya energi kinetik yang dihasilkan oleh elektron saat lepas dari permukaan logam dipengaruhi sepenuhnya oleh frekuensi foton.<\/li>\n\n\n\n<li>Intensitas radiasi foton hanya mempengaruhi banyak sedikitnya elektron yang terlepas dari permukaan logam dengan syarat frekuensinya terpenuhi. Semakin besar intensitas radiasinya, semakin banyak elektron yang akan lepas. Sebaliknya, semakin kecil intensitas radiasinya, semakin sedikit elektron yang akan terlepas.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Rumusan Efek Fotolistrik oleh Einstein<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pada tahun 1905, Albert Einstein mampu menyempurnakan fakta-fakta Lenard tentang fenomena efek fotolistrik. Poin utama yang ditekankan Einstein terkait fenomena efek fotolistrik tersebut adalah sebagai berikut.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Radiasi gelombang elektromagnetik membawa paket-paket energi dalam bentuk foton. Besarnya energi foton sebanding dengan frekuensinya. Itu artinya, energi foton tidak dipengaruhi oleh intensitas radiasinya.<\/li>\n\n\n\n<li>Besarnya energi kinetik yang dihasilkan oleh elektron sebandingan dengan selisih energi foton dan fungsi kerja atau energi ambang logam.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Secara matematis, rumus energi kinetik elektron dinyatakan sebagai berikut.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"183\" height=\"79\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/Rumusan-Efek-Fotolistrik-oleh-Einstein.webp\" alt=\"Rumusan Efek Fotolistrik oleh Einstein\" class=\"wp-image-315772\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><b>Keterangan Rumus<\/b><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ek<em><sub>maks <\/sub><\/em>= energi kinetik maksimum elektron (J)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>h <\/em>= tetapan Planck (6,6 \u00d7 10<sup>-34<\/sup> J.s)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>f<\/em> = frekuensi foton (Hz)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">f<sub>0<\/sub> = frekuensi ambang batas logam (Hz)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Penerapan Efek Fotolistrik dalam Kehidupan Sehari-Hari<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fenomena efek fotolistrik ini ternyata bisa diterapkan dalam kehidupan sehari-hari, khususnya pada peralatan kelistrikan seperti berikut.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Kalkulator<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hayo, siapa di antara Quipperian yang terbiasa menggunakan alat bantu kalkulator? Tahukah kamu jika prinsip kerja kalkulator itu memanfaatkan efek fotolistrik, lho. Di dalam kalkulator terdapat sel-sel fotolistrik. Saat terkena cahaya, elektron di dalam sel fotolistrik tersebut akan terlepas menghasilkan energi listrik. Nah, energi listrik inilah yang bisa menyalakan kalkulator.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pemindai Batang (Barcode)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Saat berbelanja di supermarket, pasti Quipperian akan melihat penggunaan mesin barcode di bagian kasir. Untuk menentukan harga barang yang kamu beli, biasanya kasir akan melakukan pemindaian kode batang, sehingga harga barangnya akan muncul di bagian layar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Di balik penggunaan mesin barcode tersebut, ternyata ada peran efek fotolistrik lho. Di dalam alat tersebut, hasil citra pemindaian akan diubah menjadi data-data elektronik melalui fenomena efek fotolistrik.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lampu LED<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Lampu LED termasuk salah satu perangkat fotonik, yaitu perangkat yang cara kerjanya memanfaatkan radiasi foton. Itulah mengapa, lampu LED ini bersifat lebih hemat listrik daripada lampu-lampu lain.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Contoh Soal Efek Fotolistrik<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Untuk mengasah pemahamanmu, yuk simak beberapa contoh soal berikut.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Contoh Soal 1<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Suatu logam dikenai sinar ungu yang frekuensinya 10<sup>16<\/sup> Hz. Jika energi ambang permukaan logam tersebut \u00bd kali energi foton yang dibawa oleh sinar ungu, berapakah energi kinetik elektron yang akan terlepas?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><b>Diketahui :<\/b><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">f = 10<sup>16<\/sup> Hz<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">W<sub>0<\/sub> = \u00bd E<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ditanya: EK<sub>maks<\/sub> =\u2026?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Jawaban<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Untuk menentukan energi kinetik maksimumnya, gunakan persamaan berikut.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/Jawaban-Soal-Efek-Fotolistrik-1.webp\" alt=\"Jawaban Soal Efek Fotolistrik 1\" class=\"wp-image-315778\" width=\"239\" height=\"229\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Jadi, energi kinetik elektron yang akan terlepas adalah 3,3 \u00d7 10<sup>-18<\/sup> J.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Contoh Soal 2<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sebuah logam memiliki frekuensi ambang 2,4 \u00d7 10<sup>16<\/sup> Hz. Lalu, logam tersebut ditembak dengan gelombang elektromagnetik yang frekuensinya 3,2 \u00d7 10<sup>16<\/sup> Hz. Tentukan besar energi kinetik elektron yang lepas dari permukaan logam tersebut!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><b>Diketahui :<\/b><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">f = 3,2 \u00d7 10<sup>16<\/sup> Hz<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">f0 = 2,4 \u00d7 10<sup>16<\/sup> Hz<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">h = 6,6 \u00d7 10<sup>-34<\/sup> J.s<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ditanya: Ek<sub>maks<\/sub> = \u2026?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Jawaban<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Energi kinetik maksimum elektron yang lepas dari permukaan logam bisa kamu tentukan dengan rumus berikut.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2023\/05\/Jawaban-Soal-Efek-Fotolistrik-2.webp\" alt=\"Jawaban Soal Efek Fotolistrik 2\" class=\"wp-image-315781\" width=\"359\" height=\"131\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Jadi, energi maksimum elektron yang lepas dari permukaan logam tersebut adalah 5,28 \u00d7 10<sup>-18<\/sup> J.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Itulah pembahasan Quipper Blog kali ini. Semoga bermanfaat, ya. Untuk mendapatkan materi lengkapnya, yuk buruan gabung Quipper Video.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hai Quipperian, siapa sih yang tidak kenal ilmuwan Fisika kenamaan Albert Einstein? Einstein merupakan salah satu tokoh peletak dasar Fisika Kuantum. Kemunculan Fisika Kuantum&hellip;<\/p>\n","protected":false},"author":156742495,"featured_media":315785,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[679384877],"tags":[],"ppma_author":[679386821,679386838],"class_list":["post-315760","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fisika"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - 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