Jika jarak pq=50 cm, cepat rambat gelombang tersebut... M/s

50 cm = 5/4 lamda
lamda = 40 cm

T = 2,5 x 4/5
T = 2 second

v = lamda / T
v = 40 / 2
v = 20 cm

diketahui =
banyak gelombang =1,25
jarak gelombang = 50 cm
lama waktu bergetar = 2,0 s
dit:V=...?
V= 50/1,25 : 2
= 40 : 2
= 20 m/s