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QUESTION: A source of sound of frequency 256Hz is moving rapidly towards a wall with a speed of 5m/s. How many beats per second will be heard if sound travels at a speed of 330m/s.. MY ATTEMPT: Using Doppler's Effect: f ' = (c/c-v)f where c = speed of sound in the medium = 330 m/s v= velocity of source = 5m/s f= 256 Hz On solving the above equation.. u get f' as approximately 260Hz.. Hence beats per second = 260-256 = 4Hz.. But the answer says 8Hz... How???


QUESTION:

A source of sound of frequency 256Hz is moving rapidly towards a wall with a speed of 5m/s. How many beats per second will be heard if sound travels at a speed of 330m/s..

 

MY ATTEMPT:

Using Doppler's Effect:

 f ' = (c/c-v)f

where c = speed of sound in the medium = 330 m/s

v= velocity of source = 5m/s

f= 256 Hz

On solving the above equation.. u get f' as approximately 260Hz..

Hence beats per second = 260-256 = 4Hz..

 

But the answer says 8Hz... How???

 

 

 


Grade:10

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