MHT CET Physics question
A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per second when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was [AIEEE 2003, CBSE PMT 2010]
Answer: (D)
Solution
The string frequency is 261 Hz or 251 Hz; increasing the tension raises its frequency, and the beats decrease only if it was 251 Hz (rising towards
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