A boy timed 30 oscillations of a certain pendulum thrice and obtained 1min. 10s, 1min. 12s and 1min. 7s respectively.The mean period of oscillation of the pendulum is
A
0.14s
B
0.43s
C
2.32s
D
6.97s
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Total time = (3 x 60) + 29
= 209sec
period \(\frac{t}{n}\) = \(\frac{209}{90}\)
= 2.32sec
Source: Myschool Past Questions Archive (Record #28184)