Physics · 2023
JEE Main · 6 April 2023, Shift 1 · Q51
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…
A person driving car at a constant speed of $\displaystyle 15 \mathrm{~m} / \mathrm{s}$ is approaching a vertical wall. The person notices a change of $\displaystyle 40$ Hz in the frequency of his car's horn upon reflection from the wall. The frequency of horn is $\displaystyle \_\_\_\_$ Hz.
(Given: Speed of sound : $\displaystyle 330 \mathrm{~m} / \mathrm{s}$ )
Official answer
From NTA’s final answer key for this paper.
420
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JEE Main 2023 Physics question, with the answer from NTA’s final answer key. Where our answers come from.