Physics · 2020
JEE Main · 4 September 2020, Shift 2 · Q10
The driver of a bus approaching a big wall notices that the frequency of his bus's horn changes from 420 Hz to 490 Hz when he hears it after it gets…
The driver of a bus approaching a big wall notices that the frequency of his bus's horn changes from $\displaystyle 420$ Hz to $\displaystyle 490$ Hz when he hears it after it gets reflected from the wall. Find the speed of the bus if speed of the sound is $\displaystyle 330 \mathrm{~ms}^{-1}$.
Official answer
(3)
$\displaystyle 91 \mathrm{kmh}^{-1}$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.