NVAMediumJEE Main 2023 · 6 April, Shift 1Doppler Effect

Physics Question from JEE Main 2023 · 6 April, Shift 1

A person driving a car at a constant speed of 15m/s15 \, \text{m/s} is approaching a vertical wall. The person notices a change of 40Hz40 \, \text{Hz} in the frequency of his car's horn upon reflection from the wall. The frequency of the horn is in Hz:

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