Correct option is 1) 20s
A seconds pendulum is defined as a pendulum that takes exactly 2 seconds to complete one full oscillation (back and forth motion).
The time period (T) of a seconds pendulum is 2 seconds. This means that every complete oscillation takes 2 seconds.
To find the total time taken for 10 oscillations, we multiply the time period of one oscillation by the number of oscillations:
Total Time = Time Period x Number of Oscillations
Total Time = 2 seconds x 10 = 20 seconds.
Therefore, the time taken to complete 10 oscillations by a seconds pendulum is 20 seconds.
