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◾ Materi : Getaran dan Gelombang◾ Sub materi : Gelombang
◾ Mapel : Fisika
Diketahui :
y = 0,4 sin 0,8π (120t - x)
Ditanya :
A, f, λ dan V
Penyelesaian :
*Sederhanakan persamaan gelombang
y = 0,4 sin 0,8π (120t - x)
y = 0,4 sin (96πt - 0,8πx)
*Cari amplitudo
A = 0,4 cm
*Cari frekuensi gelombang
ω = 96π
2πf = 96π
f = 48 Hz
*Cari panjang gelombang
k = 0,8π
2π/λ = 0,8π
λ = 2,5 cm
*Cari cepat rambat gelombang
v = λf
v = (2,5)(48)
v = 120 cm/s
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-vin