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  • A source of sound of frequency 256 Hz is moving rapidly towards a wall with a velocity of 5 m/sec. If sound travels at a speed of 330 m/sec, then number of beats per second heard by an obser

A source of sound of frequency 256 Hz is moving rapidly towards a wall with a velocity of
5 m/sec. If sound travels at a speed of 330 m/sec, then number of beats per second heard by an observer between the wall and the source is:

Option: 1

7.7H_{Z}

 

 

 


Option: 2

9H_{Z}


Option: 3

4 H_{Z}


Option: 4

None of these


Answers (1)

best_answer

For a stationary observer between wall and source

, freq from the direct source =\left ( \frac{V}{V-V_{s}} \right )f_{0}

freq. from reflected sound =\left ( \frac{V}{V-V_{s}} \right )f_{0}

So no beat will be heard

Posted by

manish painkra

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