Question

please open the attachment and answer it please​

Answer 1

Explanation:

1️⃣To 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 in a vertical plane. Now, the time 't' for 20 complete oscillations is measured with the help of a stop watch. After that, 't' is divided by 20 to obtain time period.

2⃣ To find the time period, the time for the time for the number of oscillations more than 1 is noted because the least count of stopwatch is actually either 1 s or 0.5 s. It cannot record the time period in fractions such as 1.2 s or 1.3 s or 1.4 s and so on.