A tuning fork of frequency \( 480 \mathrm{~Hz} \) is used in an exp...

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A tuning fork of frequency \( 480 \mathrm{~Hz} \) is used in an experiment for measuring speed of sound \( (v) \) in air by resonance tube
\( \mathrm{P} \) method. Resonance is observed to occur at two successive lengths of the air column \( l_{1}=30 \mathrm{~cm} \) and \( l_{2}=70 \mathrm{~cm} \). Then
W \( v \) is equal to
[JEE (Main) 2019]
(a) \( 338 \mathrm{~ms}^{-1} \)
(b) \( 332 \mathrm{~ms}^{-1} \)
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