The driver of a car travelling with spee...

The driver of a car travelling with speed `30ms^-1` towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is `330ms^-1`, the frequency of reflected sound as heard by driver is

500 Hz

550 Hz

720 Hz

555 Hz

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The correct Answer is:

Frequency of reflected sound heard by the driver is `f'=f((v-v_(0))/(v-v_(s)))`
`:." "f'=600[(330-(-30))/(330-30)]=720" Hz"`

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