A simple pendulum of string length 30 cm performs 20 oscillations in 10 s . The length of the string required for the pendulum to perform 40 oscillations in the same time duration is 
cm . [Assume that the mass of the pendulum remains same.]
Text Solution
Verified by ExpertsThe correct answer is:
A
Period of simple pendulum: 
Initial period: 
Required period: 
Using 
, the ratio is: 
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