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  • Help me please, A siren emmiting frequency 800Hz is going away from a static listener with a speed of 30 m/s. Velocity of sound is 330 m/s. Find Apparent frequency.

A siren emmiting frequency 800Hz is going away from a static listener with a speed of 30 m/s. Velocity of sound is 330 m/s. Find Apparent frequency.

  • Option 1)

    733.3Hz

  • Option 2)

    644.8Hz

  • Option 3)

    286.5Hz

  • Option 4)

    481.2Hz

 

Answers (1)

best_answer

n' = n\left [ \frac{v}{v+v_{s}} \right ] = 800\left [ \frac{330}{330+30} \right ]= 733.33HZ

 

frequency of sound when source is moving away and observer is moving towards the source -

\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)

733.3Hz

This is correct

Option 2)

644.8Hz

This is incorrect

Option 3)

286.5Hz

This is incorrect

Option 4)

481.2Hz

This is incorrect

Posted by

divya.saini

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