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n = f . t
=20 . 120s
n =2400
maf klo slah
f = 20 Hz
s = 2 menit = 2(60) = 120 s
dit : banyaknya getaran (n) = ...?
jwb :
f =
20 Hz =
20 . 120 = n
2400 = n
jadi, banyaknya getaran sebanyak 2.400 kali (D)