Multiple choice

To a stationary man, the frequency of a sound source moving towards him appears to be

  1. lower than the original frequency.

  2. same as the original frequency.

  3. higher than the original frequency.

  4. lower or higher than the original frequency depending upon the speed of the source.

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This phenomenon is known as the Doppler Effect. As a sound source moves toward a stationary observer, the sound waves are compressed in front of the source. This results in a higher frequency (and higher pitch) being perceived by the observer.

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