An observer is moving towards the stationary source of sound, then

An observer is moving towards the stationary source of sound, then
  1. apparent frequency will be less than the real frequency
  2. apparent frequency will be greater than the real frequency
  3. apparent frequency will be equal to real frequency
  4. only the quality of sound will change

Solution

The observer is moving towards the stationary source of sound, then apparent frequency will be greater than the real frequency.

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