IIT JEE 2007 Practice : PHYSICS

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A massless rod BD of length L is suspended by two identical strings AB and CD of equal length as shown in the figure. A block of mass 2m is suspended at a point P. If the first harmonic frequency of the string AB is equal to the third harmonic frequency of the string CD when excited by a tuning fork, then the length PD is

4L/5

L/5

L/10

3L/4

Half-n-half Clue

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IIT JEE 2007 Practice : PHYSICS - Multiple Choice