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lambda = 20 cm
F = n/t
= 2,5/0,5
= 5 Hz
V = Lambda x F
= 20cm x 5 Hz
= 100 cm/s
jadi jawabannya C..semoga membantu
t=0,5
4lambda=80
f=n/t
=2,5/0,5 = 5Hz
lambda=80:4
=20
v=lambda.f
=20.5
=100