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17 March, 22:31

Trumpeter A holds a B-flat note on the trumpet for a long time. Person C is running towards the trumpeter at a constant velocity. Person B is running away from the trumpeter at the same rate. Person D is standing still the whole time.

Which person hears a frequency that is lower than the B-flat?

A) Person A

B) Person B

C) Person C

D) Person D

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  1. 17 March, 22:59
    0
    The person running towards the trumpet, Mr. C,

    hears a higher frequency.

    The person running away from the trumpet, Mrs. B,

    hears a lower frequency.

    The trumpeter, Mr. A, and the person who is just standing still

    and listening, Miss D, both hears the beautiful perfect B-flat.
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