A particular train has a frequency of 400 Hz. The speed of sound in air 335 m/s.

Question

A particular train has a frequency of 400 Hz. The speed of sound in air 335 m/s. If the train is moving you at 25.0 m/s while you are at, What frequency would you hear? In this case, the whistle sounds to you like a____than when both you and the train are at rest. Suppose instead that you are moving toward the train at 25.0 m/s while the train is at rest. Now what frequency would you hear? Show your work. In this case, the whistle sounds to you like a_______than when both you and the train are at rest higher pitch lower pitch

Explanation / Answer

f' = fo[ ( V+Vo) / ( V-Vs) ]

Vo = observer velocity

Vs = source velocity

V = sound velocity = 343 m/s

fo= actual frequency

f' = apprent frequency

f' = 400* ( 343 +0 ) / ( 343-25 ) = 400 * ( 343) / ( 343-25) =431.446 Hz   high pitch

c)

f' = 400* ( 343 +25) / ( 343-0 ) = 429.15 Hz

high pitch

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