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JEE Main 201912 AprilEvening Shift
Exam
JEE Main
Year
2019
Date
12 April
Shift
Evening Shift
Subject
Physics
Chapter
Experimental Physics

JEE Main 2019 · 12 April · Evening Shift · Physics · Experimental Physics

A tunning fork of frequency 480Hz is used in an experiment for...

A tunning fork of frequency 480Hz480Hz is used in an experiment for measuring speed of sound (v)\left(v\right) in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, l1=30cmandl2=70cm.{l}_{1} = 30cm and {l}_{2} = 70cm . Then, νν is equal to:

Options

  1. A384ms−1384m{s}^{- 1}
  2. B332ms−1332m{s}^{- 1}
  3. C338ms−1338m{s}^{- 1}
  4. D379ms−1379m{s}^{- 1}

Correct answer

A. 384ms−1384m{s}^{- 1}

Step-by-step solution

Speed of sound, v=2f(l2−l1)v = 2f\left({l}_{2} - {l}_{1}\right)
=2×480(0.70−0.30)= 2 \times 480\left(0.70 - 0.30\right)
=384m/s= 384m / s
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