A stationary man hears a sound of frequency 447 Hz coming from a source moving towards him
A stationary man hears a sound of frequency 447 Hz coming from a source moving towards him. The frequency of sound from the source is 385 Hz. Calculate the speed of the source in units of m/s. Assume v = 340 m/s.
Homework Answers
Using doppler's effect:
frequency received by men will be, when Source is moving towards statinary observer:
f1 = f0*(V - Vo)/(V - Vs)
f0 = frequenct of sound = 385 Hz
V = Speed of Sound = 340 m/sec
Vo = speed of Observer(men) = 0 m/sec
Vs = speed of soure = ??
f1 = frequency observed by man = 447 Hz
then, 447 = 385*(340 - 0)/(340 - Vs)
340 - Vs = 385*340/447
Vs = 340 - 385*340/447
Vs = 47.16 m/s
In 3 significant figure:
Vs = speed of the source = 47.2 m/s
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