Apabila jarak dua celah dalam percobaan Young adalah 0,3 mm dan jarak antara celah dengan layar 0,9 m, berapa panjang gelombang cahaya yang dipakai jika jarak terang pusat ke garis gelap kedua adalah 2,7 mm?

Apabila jarak dua celah dalam percobaan Young adalah 0,3 mm dan jarak antara celah dengan layar 0,9 m, berapa panjang gelombang cahaya yang dipakai jika jarak terang pusat ke garis gelap kedua adalah 2,7 mm?

Jawaban yang tepat untuk pertanyaan tersebut adalah 6×10‾⁷ m.

Diketahui :
d = 0,3 mm = 3×10‾⁴ m
L = 0,9 m
y = 2,7 mm = 27×10‾⁴ m –> gelap 2
Ditanya : λ
Jawab :
Berdasarkan hasil percobaan Thomas Young pada celah ganda yang disinari cahaya tertentu menghasilkan pola terang dan gelap pada layar.
Pola gelap pada layar memenuhi persamaan :
dy/L = (n-½)λ
dimana :
d : jarak antar celah (m)
y : jarak pita gelap ke terang pusat (m)
L : jarak layar ke celah (m)
n : orde
λ : panjang gelombang sinar (m)

Maka panjang gelombang cahaya dapat dihitung sebagai berikut :
3×10‾⁴.27×10‾⁴/0,9 = (2-½).λ
9×10‾⁷ = (3/2)λ
λ = 6×10‾⁷ m

Jadi panjang gelombang cahaya yang dipakai adalah 6×10‾⁷ m.

Semoga membantu ya 🙂

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