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Verified answer
77][f = 6×10¹⁴ Hz
n = 1,5
kecepatan rambat dalam medium
v = c / n
v = 3×10⁸ / 1,5
v = 2×10⁸ m/s ← (1) benar
panjang gelombang di udara
λ = c / f
λ = 3×10⁸ / 6×10¹⁴
λ = 5×10⁻⁷ m ← (3) benar
panjang gelombang dalam medium
λ' = λ / n
λ' = 5×10⁻⁷ /1,5
λ' = 3⅓×10⁻⁷ m ← (2) salah
frekuensi gelombang dalam medium tetap
f' = f = 6×10¹⁴ Hz ← (4) salah