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12 August, 18:08

You hear 2 beats per second when two sound sources, both at rest, play simultaneously. The beats disappear if source 2 moves toward you while source 1 remains at rest. The frequency of source 1 is 500 Hz. The frequency of source 2 is ...

A) 498 Hz.

B) 496 Hz.

C) 502 Hz.

D) 500 Hz.

E) 504 Hz.

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Answers (1)
  1. 12 August, 20:47
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    Option A

    498 Hz

    Explanation:

    Beat frequency is given by F1-F2 where F is the frequency of source while F2 is frequency that disappear as one moves towards the source. when a source moves towards observer the frequency increases

    Substituting 500 for F1 and 2 for F2 then

    Beat frequency is 500-2=498 Hz

    Option A
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