MHT CET 2024 Physics question
A wire under tension 225 N produces 6 beats per second when it is tuned with a fork. When the tension changes to 256 N, it is again tuned with the same tuning fork, the number of beats remain unchanged. The frequency of tuning fork will be
Answer: (B)
Solution
The frequency of a vibrating wire is . Let the frequency of the wire be at tension 225 N and at 256 N. The number of beats is the same (6) in both cases, but the wire frequency has increased, so the wire frequency must be below the fork
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