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Dik :
vs = 10 m/s (menjauh)
vp = 0 m.s (diam)
fs = 400 Hz
v = 390 m/s
Dit :
fp = .................?
Penyelesaian :
. . . . . . v
fp = ______ X fs
. . . . v + vs
. . . . . . 390
fp = ________ X 400
. . . . 390 + 10
fp = (390 x 400)/400
fp = 390 Hz
Jadi, frekuensi yang terdengar adalah 390 Hz
Ok?