A pendulum has a time period 
in air. When it is made to oscillate in water its time period is 
. Then the relative density of the material of the bob of the pendulum is (neglect damping)
A
B
2
C
D
3
Text Solution
Verified by ExpertsThe correct answer is:
B
The effective acceleration of a bob in water
Here 
and 
are the density of water and the bob respectively.
The time period in air is
……(i)
The time period in water is
…..(ii)
Divide equation (2) by (1), we have
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