Q.

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

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a

49 gm-wt

b

63 gm-wt

c

61 gm-wt

d

14gm-wt

answer is A.

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Detailed Solution

T∝1/p2 âˆ´ T2T1=p1p22  or  T2=T1p1/p22 or T2=9×(7/3)2=49gm−wt
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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