In this question, a statement of assertion 
is followed by a statement of reason 
. Mark the correct choice as:
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.
Text Solution
Verified by ExpertsThe correct answer is:
A
According to the property of persistence of hearing, the impression of a sound heard persists on our mind for 
. 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 
]
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