Physics · 2022
JEE Main · 28 July 2022, Shift 1 · Q57
The frequency of echo will be \ \ \ \ Hz if the train blowing a whistle of frequency 320 Hz is moving with a velocity of 36 km/h towards a hill from…
The frequency of echo will be \_\_\_\_ Hz if the train blowing a whistle of frequency $\displaystyle 320$ Hz is moving with a velocity of $\displaystyle 36$ km/h towards a hill from which an echo is heard by the train driver. Velocity of sound in air is $\displaystyle 330 \mathrm{~m} / \mathrm{s}$.
Official answer
340
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JEE Main 2022 Physics question, with the answer from NTA’s final answer key. Where our answers come from.