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COMEDK2017PhysicsWaves and Sound

The disc of a siren containing 60 holes rotates at a constant speed of 360 rpm . The emitted sound is in unison with a tuning-fork of frequency

Options

  1. A10 ~Hz
  2. B360 ~Hz
  3. C216 kHz
  4. D6 ~Hz

Correct answer

B. 360 ~Hz

Step-by-step solution

The number of waves produced by the disc is equal to number of notes i.e., n=60 Speed of rotation, v=360 rpm = 360 60 =6 rps Frequency =n v=60 6=360 ~Hz

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