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T(periode)=1/f=5/7s
λ = 5 meter
T = ...?
f = ....?
v = λ f
7 = 5 f
f = 7/5
f = 1,4 Hertz
v = λ/T
7 = 5/T
T = 5/7
T = 0,714 sekon
atau,
T = 1/f
T = 1/1,4
T = 0,714 sekon