Question

In the case of a simple pendulum, a graph is drawn between the displacement and time taken for its oscillations as shown in the figure . Then
From the given figure, the number of oscillation performed by the bob at the end of 21 s is ________

A. 3
B. 4
C. 2
D. ` 3^(1//2)`

Answer 1

Correct Answer - D
from the graph , it is clear that the bob is undergoing `3^(1//2)` oscillations, i.e, for one oscillation it takes 6 seconds.
in 21 seconds, if performs ` 21/6 = 3^(1//2)` oscillations.