Physics · 2014
JEE Main · 11 April 2014, Shift 1 · Q15
Two factories are sounding their sirens at 800 Hz. A man goes from one factory to other at a speed of 2 m/s. The velocity of sound is 320 m/s. The…
Two factories are sounding their sirens at $\displaystyle 800$ Hz . A man goes from one factory to other at a speed of $\displaystyle 2$ m/s. The velocity of sound is $\displaystyle 320$ m/s. The number of beats heard by the person in one second will be :
Official answer
(4)
$\displaystyle 10$
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JEE Main 2014 Physics question, with the answer from NTA’s final answer key. Where our answers come from.