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 it is to hear them.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true and reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion and reason both are false.

Answer

B

Explanation

According to the property of persistence of hearing the impression of a sound heard persists on our mind for `(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.