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  • A source of frequency 'f' is stationary and an observer starts moving towards it at t = 0 with constant small acceleration. Then the variation of observed frequency f ' registered by th

A source of frequency 'f' is stationary and an observer starts moving towards it at t = 0 with constant small acceleration. Then the variation of observed frequency f ' registered by the observer with time is best represented as :

Option: 1


Option: 2


Option: 3


Option: 4


Answers (1)

 

Frequency of sound when source and observer are moving towards 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

 

 

After a time t, velocity of observer V0 = at

\therefore f_{0}=\left ( \frac{V+V_{0}}{V} \right ), f_{s}=\left ( \frac{V+at}{V} \right )f_{s}, which is a straight line graph of positive slpoe.

Posted by

Ramraj Saini

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