waktu(t) nya berapa?

cepat rambat
v = lamda/ T
v : cepat rambat
T : periode

Cari periode dulu !
T = t/n
T = 2/3 s

Cepat rambat
lamda : 2/2 = 1
v = 1 ÷ 2/3
v = 3/2
v = 1,5 m/s

2 lamda = 2 meter
lamda = 1 meter
3 lamda = 2 s
lamda = 2/3 s

V = lamda/T
= 1 : 2/3 = 3/2 atau 1,5 m/s
T = 2/3 s
jawabannya (D.)

semoga membantu:)