Questions
A police car horn emits a sound at a frequency 240 Hz when the car is at rest. If the speed of the sound is 330 m/s, the frequency heard by an observer who is approaching the car at a speed of 11 m/s, is :
a
248 Hz
b
244 Hz
c
240 Hz
d
230 Hz
detailed solution
Correct option is A
Frequency heard by the observern'=n v+v0v=240 330+11330=248 Hz.Talk to our academic expert!
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An observer is moving towards the stationary source of sound, then
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