NEET 2009 Physics question
The driver of a car travelling with speed towards a hill sounds a horn of frequency . If the velocity of sound in air is , the frequency of reflected sound as heard by driver is:
Answer: (2)
Solution
The hill first acts as a stationary observer receiving sound from a source (car) moving towards it: . The hill then acts as a stationary source of frequency 660 Hz and the driver is an observer moving towards it:
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