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When the source of a wave is moving relative to an observer of the wave, which of the following is true?
o observers ahead of the wave observe an apparent increase in wave frequency
observers both ahead of and behind the wave notice an increase in frequency
observers in all directions notice a decrease in wave frequency
observers behind the wave observe lower wavelengths and higher frequency

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znk

Answer:

Observers ahead of the wave observe an apparent increase in wave frequency  

Explanation:

This is the Doppler Effect. The frequency of a wave increases when the source approaches the observer and decreases as the source recedes.

B, C, and D are wrong. Observers behind the source notice a decrease in frequency.

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