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*A = 10 cm = 0,1 m
*λ = 2 cm = 0,02 m
*T = 0,1 s
*f = 10 Hz
*y = ... ?
Untuk persamaan gelombang umum adalah:
y = A sin ωt
= A sin (ωt - kx)
= A sin (2πt - 2πx/λ)
Nah, cari dulu ω (2πf) dan k-nya:
*ω = 2πf
= 2 x π x 10 Hz
= 20 rad/s
*k = 2πx/λ
= 2πx/0,02
= 100πx
Maka, persamaan gelombangnya:
y = A sin (-ωt + kx)
= 0,1 sin (100x - 20πt)
= 0,1 sin 10π (10x - 2t) (C)