Question

A person is standing near a railway track and a railway engine while blowing its whistle is combing towards that person with a constant velocity of $50$ miles/hour. The person will notice that.

• A. The intensity of the sound increase but its frequency remains unaltered
• B. Both the intensity and frequency of the sound increases
• C. Both the intensity and frequency of sound remain unaltered
• D. The intensity of the sound increases but its frequency decreases

Answer 1

The correct option is B Both the intensity and frequency of the sound increases

From Doppler's effect it can be said as the source appears towards the observer both the intensity and frequency of the sound increases.