A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: B
Solution :
According to the property of persistence of hearing, the impression of a sound heard persists on our mind for \[\frac{1}{10}\]sec. Therefore, number of beats per sec should be less than 10. Hence difference in frequencies of two sources must be less than 10.
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