Waves Ques 55
55. 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: 55.(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.
BETA
