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Assertion : To hear distinct beats, difference in frequencies of two sources should be less than 10 .
Reason: More the number of beats per sec more difficult to hear them.
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Reason: More the number of beats per sec more difficult to hear them.
Solution:
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If both assertion and reason are true and reason is the correct explanation of assertion.
According to the property of persistence of hearing, the impression of a sound heard persists on our mind for $\frac{1}{10} \mathrm{sec}$. Therefore, number of beats per sec should be less than 10 . Hence difference in frequencies of two sources must be less than 10 . [beats per sec $=v_2-v_1$ ]
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