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19 September, 12:00

How do you describe the frequency of waves perceived by the observer from the moment the source appears to the moment it disappears?

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  1. 19 September, 12:19
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    Answer: the frequency increases and decreases.

    Explanation: According to doppler effect, the frequency of waves tends to increase as the source approaches and decrease as the source disappears.

    The Doppler effect occurs when a source of waves and/or observer move relative to each other, resulting in the observer measuring a different frequency of the waves than the frequency that the source is emitting.
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