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  • A person driving car at a constant speed of 15 m/s is approaching a vertical wall. The person notices a change of 40 Hz in the frequency of his car's horn upon reflection from the wall.

A person driving car at a constant speed of 15 m/s is approaching a vertical wall. The person notices a change
of 40 Hz in the frequency of his car's horn upon reflection from the wall. The frequency of horn is ______ Hz.

Option: 1

420


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

\begin{aligned} & f^{\prime}=f_0+40 \\ & \Rightarrow f_0\left(\frac{330+15}{330-15}\right)=f_0+40 \\ & \Rightarrow f_0 \times \frac{345}{315}=f_0+40 \\ & \Rightarrow f_0 \times \frac{30}{315}=40 \\ & \Rightarrow f_0=40 \times \frac{315}{30}=420 \mathrm{~Hz} \end{aligned}

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