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  • Help me understand! - Oscillations and Waves - JEE Main-4

A source and listener are both moving towards each other with speed \frac{v}{10} (v is speed of sound)

If frequency of note emitted by the source is 'f' the frequency heard by the listener would be

  • Option 1)

    1.11f

  • Option 2)

    1.22f

  • Option 3)

    f

  • Option 4)

    1.27f

 

Answers (1)

best_answer

v' =\frac{c+v_{0}}{c-v_{s}}v_{0}\Rightarrow v' = 11/9f\Rightarrow 1.22f

 

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)

1.11f

This is incorrect

Option 2)

1.22f

This is correct

Option 3)

f

This is incorrect

Option 4)

1.27f

This is incorrect

Posted by

Plabita

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