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  1. When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as

    2. A.

     Doppler effect
    B.

     Beats
    C.

     Resonance
    D.

     Echo

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    Answer : Option B

    Explanation :

    When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as beats.

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