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  • I need help with An observer moves towards a stationary source of sound of frequency n. The apparent frequency heard by him is 2n. If the velocity of sound v = 332 m/s, then velocity of observer is

An observer moves towards a stationary source of sound of frequency n. The apparent frequency heard by him is 2n. If the velocity of sound v = 332 m/s, then velocity of observer is

  • Option 1)

    166 m/s

  • Option 2)

    664 m/s

  • Option 3)

    332 m/s

  • Option 4)

    1328 m/s

 

Answers (1)

best_answer

n'= n[\frac{v+v_{0}}{v}]\Rightarrow 2n= n[\frac{v+v_{0}}{v}]

\frac{v+v_{0}}{v}= 2 \Rightarrow v_{0}=v= 332m/s

 

Frequency of sound when source & observer are moving away from each other -

\nu {}'= \nu _{0}.\frac{C-V_{0}}{C+V_{s}}
 

- wherein

C= Speed of sound

V_{0}= Speed of observer

V_{s}= speed of source

\nu _{0 }= Original frequency

\nu {}'= apparent frequency

 

 


Option 1)

166 m/s

This is incorrect

Option 2)

664 m/s

This is incorrect

Option 3)

332 m/s

This is correct

Option 4)

1328 m/s

This is incorrect

Posted by

prateek

View full answer

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