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a. 2gelombang 1puncak
d. V = λ / t = 30/20 = 1.5m/s
kalo ga salah yaa:D
2) T = t/n
T = 20s/2,5 gelombang = 8 s
3) panjang gelombang/lamda = s ( panjang seluruh gelombang )/n (jumlah seluruh gelombang)
lamda = 30m / 2,5 gelombang = 12 m
4) cepat rambat (v) = panjang seluruh gelombang (s) / waktu seluruh gelombang )
v = 30m / 20 s
v = 3/2 m/s