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  • I have a doubt, kindly clarify. The driver of car travelling with a speed 30 m/s towards a tall hill sounds horn of frequency 600 Hz. If the velocity of sound in air is 330 m/s the frequency of reflected sound will be

The driver of car travelling with a speed 30 m/s towards a tall hill sounds horn of frequency 600 Hz. If the velocity of sound in air is 330 m/s the frequency of reflected sound will be

  • Option 1)

    720 Hz

  • Option 2)

    555.5 Hz

  • Option 3)

    550 Hz

  • Option 4)

    500 Hz

 

Answers (1)

best_answer

v' =\frac{c+v_{car}}{c-v_{car}}v_{0}\Rightarrow v' = 720Hz

 

Doppler Effect in reflected sound -

\nu _{ap}= \nu _{0}\left ( \frac{C+V_{c}}{C-V_{c}} \right )


 

 

- wherein

C= Speed of sound

V_{c}= Speed of car

 

 


Option 1)

720 Hz

This is correct

Option 2)

555.5 Hz

This is incorrect

Option 3)

550 Hz

This is incorrect

Option 4)

500 Hz

This is incorrect

Posted by

divya.saini

View full answer

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