Which of the following statements about Doppler Effect is (are) correct? 1. You

Question

Which of the following statements about Doppler Effect is (are) correct? 1. You are at the center of a circle, and a speaker is moving around the circle. You hear an increase in frequency. 2. Car A and Car B travel at identical speeds, and Car A is behind Car B traveling in the same direction. If Car A activates a sound source, Car B will detect a reduced frequency because it is ahead of Car A. 3. A firetruck sets off its siren as it moves toward a mountain. The frequency of the reflected sound waves detected by the firetruck will be at a higher frequency than the original sound waves emitted.

Explanation / Answer

The Doppler effect is observed whenever the source of waves is moving with respect to an observer. The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding. It is important to note that the effect does not result because of an actual change in the frequency of the source.

so only option 3 is correct.

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