Waves - Result Question 57

59. A tuning fork of freqqency 512Hz 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) 510Hz

(b) 514Hz

(c) 516Hz

(d) 508Hz

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Answer:

Correct Answer: 59. (d)

Solution:

  1. (d) 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 the string is 508 as frequency of string increases with tension.


NCERT Chapter Video Solution

Dual Pane