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156. Problem 20.55 (RHK) We have to find the frequency of a 15.8-kHz whine
of the turbine in the jet engines of an aircraft moving with speed
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heard
by the pilot of a second aircraft which is trying to overtake the first at a
speed of
.
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Solution: Click For PDF Version Speed of the observer moving towards the source of sound (second aircraft) is
Speed of the source of sound (first aircraft) is
Speed of sound is
The frequency,
Therefore,
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, of the
whine of the first aircraft observed by the second aircraft will be given by the
Doppler shift relation
