Physics · 2019
JEE Main · 12 April 2019, Shift 2 · Q29
A tuning fork of frequency 480 Hz is used in an experiment for measuring speed of sound (v) in air by resonance tube method. Resonance is observed to…
A tuning fork of frequency $\displaystyle 480$ Hz is used in an experiment for measuring speed of sound (v) in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, $\displaystyle l_1=30 \mathrm{~cm}$ and $\displaystyle l_2=70 \mathrm{~cm}$. Then, $\displaystyle v$ is equal to :
Official answer
(3)
$\displaystyle 384 \mathrm{~ms}^{-1}$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.