tolongdong yg nmr 18 aja

Diket :
f = 8 Hz
λ = 6/4 = 3/2 = 90 cm

Jawab :
satu λ = 90 × 2/3 = 60 cm = 0,6 m

v = λ × f = 0,6 m × 8 Hz = 4,8 m/s (B)