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Beats are produced. Frequency of beats will be 1/3 - 1/4 = 1/12. Hence time period = 12 s.

1. 12 s
2. 6 s
3. 3 s
4. 1 s

Correct answer: 12 s

Solution

The beat frequency is the absolute difference between the two frequencies, which is 1/12 Hz. The time period of beats is the reciprocal of the beat frequency, i.e., 12 s.

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