tolong dibantu nomor 56 dan 57

1. 2.5 lamda = 150
lamda = 150 x 2/5
= 60 cm
2. 4.5 lamda = 1.8
lamda = 1.8 x 2/9
= 0.4 cm
v = lamda f.
5,6 = 0.4 f
F = 14
F = n/t
n = f . t ---> 14 . 1 = 14 gelombang.

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