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l = 10 cm
Dit : V=.....?
l = 1 lamda
lamda = l / 1
lamda = 10 / 1
= 10 cm
V = lamda/ T
= 10 / 4
= 2,5
panjang gel = 10 cm
ditanya : V/
jawab : v = panjang gel/T
= 10/4
= 2.5 m/s