Q.

The source of sound generating a frequency of 3 kHz reaches an observer with a speed of 0.5 times speed of sound in air. The frequency(in kHz ) heard by the observer is

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answer is 6.

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Detailed Solution

According to Doppler's effectf=(v±v0v±vs)f  ​here v0=0 and vs=0.5v​∴f=(vv−0.5v)3=6kHz​
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