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  • Can someone help me with this, A source of sound of frequency 500 Hz is moving towards an observer with velocity 30 m/s. The speed of sound is 330 m/s. The frequency heard by the observer is

A source of sound of frequency 500 Hz is moving towards an observer with velocity 30 m/s. The speed of sound is 330 m/s. The frequency heard by the observer is

  • Option 1)

    550 Hz

  • Option 2)

    458.3 Hz

  • Option 3)

    530 Hz

  • Option 4)

    545 Hz

 

Answers (1)

best_answer

v' = \frac{c}{c- v_{s}} X v_{o} \Rightarrow \frac{330}{330-30} X 500 \Rightarrow v' = 550 Hz

 

Frequency of sound when observer is stationary and source is moving towards observer -

\nu {}'= \nu _{0}.\frac{C}{C-V_{s}}
 

- wherein

C= speed of sound

V_{s}= speed of source

\nu _{0}= original frequency

\nu {}'= apparent frequency

 

 

 


Option 1)

550 Hz

This is correct.

Option 2)

458.3 Hz

This is incorrect.

Option 3)

530 Hz

This is incorrect.

Option 4)

545 Hz

This is incorrect.

Posted by

prateek

View full answer

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