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20 January, 04:34

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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  1. 20 January, 04:47
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    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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