Published by:
CGP EDU Academic Team
Published on: August 14, 2026
A simple pendulum of string length 30 cm performs 20 oscillations in 10s. 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:
C
Time period becomes half
and 
So, length 
beocmes 
So, 
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