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λ = 20 cm
T =t/n
T= 0,4/2
T= 0,2 s
f= 1/T
f=1/0,2
f= 5 Hz
v= λ f
v = 20 x 5
v = 100 cm/s
jawabannya yg C
λ=70/3,5 glb=20 cm
V=f x λ=5 Hz x 20 cm=100 cm/s
Jdi jawabnya adalah C (frekuensi=5 dan cepat rambat=100). Salam kenal.