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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
Options
(a) 510 Hz
(b) 514 Hz
(c) 516 Hz
(d) 508 Hz
Correct Answer:
508 Hz
Explanation:
The frequency of the piano string = 512+-4 = 516 or 508. When the tension is increased, beat frequency decreases to 2, it means that frequency of othe string is 508 as frequency of string increases with tension.
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- An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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