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  • A source of sound is travelling towards a stationary obserever. The frequency of the sound heard by the observer is of three times the original frequency . The velocity of sound is V m/s . The spee

A source of sound is travelling towards a stationary obserever. The frequency of the sound heard by the observer is of three times the original frequency . The velocity of sound is V m/s . The speed of sound will be - 

Option: 1

\mathrm{\frac{2}{3}V}


Option: 2

\mathrm{V}


Option: 3

\mathrm{\frac{3}{2}V}


Option: 4

\mathrm{3V}


Answers (1)

best_answer

Use, \mathrm{\begin{aligned} & n^{\prime}=n\left(\frac{v}{v-v_s}\right) \Rightarrow \frac{n^{\prime}}{n}=\frac{v}{v-v_s} \\ & \frac{v}{v-v_s}=3 \\ & v=3 v-3 v_s \\ & 2 v=3 v_s \\ & v_s=2 v / 3 \end{aligned}}

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Divya Prakash Singh

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