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t= 2,5 s
n= 900
a) f= n/t
= 900/2,5
= 360 Hz
b) T=1/f
=1/360 s
= 900/2,5
= 360 Hz
n=jumlah gelombang
t=waktu (s)
b). y = u/f
= 4/360
= 1/90 m
u= cepat rambat
y= panjang gelombang
f= frekuensi