AIPMT PRELIMS 2010 Physics Sound Waves MCQ Question
A tuning fork of frequency 512 Hz 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
508 Hz
510 Hz
514 Hz
516 Hz
Correct Answer
Detailed Explanation
The initial beat frequency of 4 Hz indicates the piano string frequency was either 508 Hz or 516 Hz. Increasing tension increases frequency, reducing beats to 2 Hz, confirming the initial frequency was 510 Hz.
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