Statement I: To hear distinct beats, difference in frequencies of two sources should be less than 10.
Statement II: More the number of beats per sec more difficult to hear them.

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If statement I is true but statement II is false

If both statement I and statement II are true but statement II is not the correct explanation of statement I.

If both statement I and statement II are true and statement II is the correct explanation of statement I.

If both statement I and statement II are false

answer is B.

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Detailed 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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