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A musician in a car travelling at a speed of 28.0 m/s plays a horn (modeled...

A musician in a car travelling at a speed of 28.0 m/s plays a horn (modeled as an open-closed tube 33.0 cm long). The note played is at its fundamental frequency. What frequency does an observer standing on the side of the road hear as the car approaches her? Assume the speed of sound is 340 m/s.

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Answer #1

This can be solved using the Doppler effect in sound. I.e.

where is the source frequency

v is the speed of observer which is zero here,

V is the speed of the source.

Source frequency can be found out using relation

=speed of sound/ wavelngth = 340/0.33 =1030 Hz.

v=0

V=28+340 =368 m/s

Since V/c is very much smaller than 1.Therefore , the frequency an observer standing on the side of the road year as car approaches her is about 1030 Hz.

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