First slide

Standing waves

Question

In Melde's experiment, the string vibrates in 7 segments under tension of 9 gm-wt. If the string is to be vibrated in 3 segments, then the tension required will be

Moderate

A

49 gm-wt
B

63 gm-wt
C

61 gm-wt
D

14gm-wt

Solution

$T â 1 / p^{2} â´ \frac{T_{2}}{T_{1}} = {(\frac{p_{1}}{p_{2}})}^{2} or T_{2} = T_{1} {(p_{1} / p_{2})}^{2} or T_{2} = 9 Ã (7 / 3)^{2} = 49 gm â wt$

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