NEET 2010 Physics question
A tuning fork of frequency makes 4 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per sec when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was
Answer: (4)
Solution
Beats of 4 per second means the string frequency is , i.e. 516 Hz or 508 Hz. Frequency of a stretched string is , so increasing the tension increases the string's frequency. If the string were at 516 Hz, increasing its frequency would move it further from 512 Hz and the beat frequency
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