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T = waktu 1 gelombang = 2 s.
panjang 1,25 gelombang = 250 cm
lamda = panjang 1 gelombang = 250 cm : 1,25
lamda = 200 cm
v = lamda / T
v = 200 cm / 2s
v = 100 cm/s (A)
5) n = 1/2 = 0,5
t = 0,2 s
f = n/t = 0,5/0,2 = 5/2 = 2,5 Hz
Amplitudo = 5 cm
Jawaban: B