Multiple choice

Which of the following statements is/are correct for Doppler’s effect?

(1) It is the change in frequency of sound wave for a listener moving relative to its source. (2) It is the reflection of sound, reaching the listener some time after the direct sound.

  1. Only (1)

  2. Only (2)

  3. Both (1) and (2)

  4. Neither (1) nor (2)
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A Correct answer
Explanation

Statement (1) is correct. Doppler’s effect is the change in frequency of sound waves for a listener moving relative to its source. Statement (2) is wrong. Reflection of sound, reaching the listener some time after the direct sound is called echo.

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