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diket :
L= 90 cm
n = 1,5
f = 2 Hz
jwb ; L=n.λ
90 = 1,5 .λ
λ = 60
v = λ.f
= 60 . 2
= 120 cm/s
Lamda = 60 cm
T = 1/f
T = 1/2 = 0,5s
v = Lamda / T
v = 60cm/ 0,5s
v = 120 cm/s