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Question
How do you measure the time period of a given pendulum? Why do you note the time for more than one oscillation?
Solution
Measurement of time period of a simple pendulum:
(i) To measure the time period of a simple pendulum, the bob is slightly displaced from its mean position and is then released. This gives a to and fro motion about the mean position to the pendulum.
(ii) The time 't' for 20 complete oscillations is measured with the help of a stopwatch.
(iii) Time period 'T' can be found by dividing 't' by 20.
To find the time period, the time for the number of oscillations more than 1 is noted because the least count of stopwatch is either 1 s or 0.5 s. It cannot record the time period in fractions such as 1.2 or 1.4 and so on.
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