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λ=3/2,5=1,2m
F=λ.v
F=1,2.200
F=240Hz
T=1/F
T=1/240
T=0,004s
v=λxf
200=120 x f
f=200 : 120
f=5/3
T=1/f
T=1.5/3= 5/3