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vp = 0
fp = 680 Hz
v = 340 m/s
ditanya : vs = .... ?
dijawab :
fp = (v - vp) . fs / (v - vs)
680 = (340 - 0) . 670 / (340 - vs)
680 = 227800 / (340 - vs)
(340 - vs) = 227800 / 680
(340 - vs) = 335
vs = 340 - 335
vs = 5 m/s