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  • A car sounding its horn at 480 Hz moves towards a high wall at a speed of 20 m/s,the frequency of the reflacted sound hard by the man sitting in the car will be nearest to (take speed of sound

A car sounding its horn at 480 Hz moves towards a high wall at a speed of 20 m/s,the frequency of the reflacted sound hard by the man sitting in the car will be nearest to (take speed of sound =330 m/s)

 

Option: 1

480 Hz


Option: 2

510 Hz


Option: 3

542 Hz


Option: 4

570 Hz


Answers (1)

best_answer

\mathrm{\begin{aligned} f^{\prime}=f\left(\frac{k+u_0}{v-v_s}\right) & =480\left(\frac{330+20}{330-20}\right) \\ & =542 \mathrm{~Hz} . \text { Arr. } \end{aligned}}

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