abbyphillips1649 abbyphillips1649

04-03-2018
Physics

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With what speed must you approach a source of sound to observe a 25% change in frequency?

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04-03-2018

sound source is at rest, you are moving with velocity v, f = frequency, c = speed of sound:

f = f0(1 + v/c)

115 = 100(1 + v/343)
115 = 100 + 100v/343
15 = 100v/343
v = 15*343/100
v = 51,45 m/s

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