Physics · 2014
JEE Main · 12 April 2014, Shift 1 · Q15
A source of sound A emitting waves of frequency 1800 Hz is falling towards ground with a terminal speed v. The observer B on the ground directly…
A source of sound A emitting waves of frequency $\displaystyle 1800$ Hz is falling towards ground with a terminal speed $\displaystyle v$. The observer B on the ground directly beneath the source receives waves of frequency $\displaystyle 2150$ Hz. The source A receives waves, reflected from ground, of frequency nearly : $\displaystyle ($ Speed of sound $\displaystyle =343 \mathrm{~m} / \mathrm{s})$
Official answer
(2)
$\displaystyle 2500$ Hz
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JEE Main 2014 Physics question, with the answer from NTA’s final answer key. Where our answers come from.