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Waves question

2008 · Shift 2 · Q52
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Waves question

2008 · Shift 2 · Q52

JEE AdvancedPhysicsWavesMCQ+3 / −1
A vibrating string of certain length 1 under a tension T resonates with a mode corresponding to the first overtone (third harmonic) of an air column of length 75 cm inside a tube closed at one end. The string also generates 4 beats per second when excited along with a tuning fork of frequency n. Now when the tension of the string is slightly increased the number of beats reduces to 2 per second. Assuming the velocity of sound in air to be 340 m/s, the frequency n of the tuning fork in Hz is:
  1. A
    344
  2. B
    336
  3. C
    117.3
  4. D
    109.3
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