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  • A car sounding a horn of frequency 1000 Hz passes an observer. The ratio of frequencies of the horn noted by the server before and after passing of the car is 11:9 . If the speed of sound is V, the

A car sounding a horn of frequency 1000 Hz passes an observer. The ratio of frequencies of the horn noted by the server before and after passing of the car is 11:9 . If the speed of sound is V, the speed of the car is?

Option: 1

\mathrm{\frac{1}{10}V}


Option: 2

\mathrm{\frac{1}{2}V}


Option: 3

\mathrm{\frac{1}{5}V}


Option: 4

\mathrm{V}


Answers (1)

best_answer

\mathrm{\begin{aligned} & n_{\text {Before }}=\frac{v}{v-v_c} \cdot n \text { and } n_{\text {After }}=\frac{v}{v+v_c} \cdot n \\ & \frac{n_{\text {Before }}}{n_{\text {After }}}=\frac{11}{g}=\left(\frac{v+v_c}{v-v_c}\right) \\ & 11 v-11 v_c=g v_{+} g v_c \\ & 11 v-g v=9 v_c+11 v_c \\ & 2 v=20 v_c \\ & V_c=\frac{V}{10} & \end{aligned}}

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himanshu.meshram

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