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  • When an observer moves toward a stationary source with a certain velocity, he observes an apparent frequrncy f. When it moves away from the source with same velocity, the observed frequency is o.s.

When an observer moves toward a stationary source with a certain velocity, he observes an apparent frequrncy f. When it moves away from the source with same velocity, the observed frequency is o.s.f. If the velocity of sound is v, then the speed of the observer is -

Option: 1

\mathrm{\frac{V}{4}}


Option: 2

\mathrm{\frac{V}{8}}


Option: 3

\mathrm{\frac{V}{9}}


Option: 4

None of these


Answers (1)

best_answer

Suppose \mathrm{fo} be actual frequency.

then,\mathrm{f=f_0\left(\frac{u+u_0}{u}\right)}

and \mathrm{0.8 f=f_0\left(\frac{u-v_0}{u}\right)}

solving these two equations, we get,

\mathrm{v_2=\frac{v}{9}}

 

Posted by

chirag

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