2(iii)
The displacement–time graph of a sound wave produced by a vibrating wire is shown below.
(a) How will you adjust the tension in the wire, to reduce the length of PR?
(b) Which characteristic of sound is affected by the reduction in the length of PR?
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(a) As PR is the time period of the vibration and reduction of time period means the increase of frequency. Also, Frequency is proportional to square root of the tension.
So, tension is to be increased to increase the frequency i.e., to reduce the time period.
(b) Since, pitch depends on frequency, pitch will be affected by reduction of PR.