Waves - Result Question 57
59. A tuning fork of freqqency $512 Hz$ 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 [2010]
(a) $510 Hz$
(b) $514 Hz$
(c) $516 Hz$
(d) $508 Hz$
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Answer:
Correct Answer: 59. (d)
Solution:
- (d) The frequency of the piano string $=512 \pm 4=516$ or 508 . When the tension is increased, beat frequency decreases to 2 , it means that frequency of the string is 508 as frequency of string increases with tension.
