The first time the pendulum passes through Y, a stopwatch is started. |
The twenty-first time the pendulum pass through Y, the stopwatch is stopped. The reading is T. |
A) 7740
B) 7721
C) 7720
D) 7710
Correct Answer: D
Solution :
The time taken to complete one oscillation is called the time period of a pendulum. |
Here the time period is the time taken to move from Y to B then back to A and then to Y. The reading of stopwatch = T Number of oscillations = 10 \[\therefore \] Time taken \[=\frac{Time\text{ }period}{Number\text{ }of\text{ }oscillations}\] \[=\frac{T}{10}\] |
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