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160. Problem 20.69 (RHK) A person in a car blows a trumpet sounding at 438 Hz.
The car is moving toward a wall at
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. We
have to calculate (a) the frequency of sound as received at the wall and
(b) the frequency of the reflected sound arriving back at the source.|
Solution: Click For PDF Version Sound waves of frequency 438 Hz is emitted by a car moving
with speed
where
Frequency of the reflected sound waves received by the observer moving toward
the wall with speed of
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is the
speed of sound in air. Therefore, the frequency
of the sound received at the wall will be
