An engine is moving on a circular track with a constant speed. It is blowing a whistle of frequency…

An engine is moving on a circular track with a constant speed. It is blowing a whistle of frequency $500\text{ Hz}$. The frequency received by an observer standing stationary at the centre of the track is An engine moving on a circular track with a stationary observer at the center.
  1. 500 Hz
  2. more than 500 Hz
  3. less than 500 Hz
  4. more or less than 500 Hz depending on the actual speed of the engine

Solution

Since, there is no relative motion between the source and listener, so apparent frequency is equal to original frequency.

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