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Question

A wavelength 0.60  cm is produced in air and it travels at a speed of  300 ms1. It will be an –
  1. Audible wave
  2. Infrasonic wave
  3. Ultrasonic wave
  4. None of the above 


Solution

The correct option is C Ultrasonic wave

n=vλ=3000.6× 102Hz=36× 105 Hz=50,000 Hz
Wave is ultrasonic.

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