Wave Motion 2 Question 15

15. A massless rodBD is suspended by two identical massless strings AB and CD of equal lengths. A block of mass m is suspended from point P such that BP is equal to x. If the fundamental frequency of the left wire is twice the fundamental frequency of right wire, then the value of x is

(2006)

(a) l/5

(b) l/4

(c) 4l/5

(d) 3l/4

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Answer:

Correct Answer: 15. (a)

Solution:

  1. fvTfAB=2fCD

TAB=4TCD

Further

Στp=0

TAB(x)=TCD(lx)  or 4x=lx  or ( as TAB=4TCD)

or

x=l/5



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