Question

if the time period of oscillation of a pendulum is measured as 2.5 second using a stopwatch with least count 0.5 second then the permissible error in the measurement is

Answer 1

Time period of pendulum, T = 2.5
error in time period , ∆T = 0.5
We know,
% error in measurement of time period = error in time period/time period× 100
= ∆T/T × 100.
= 0.5/2.5 × 100
= 100/5
= 20

Hence, error in measurement = 20%

Answer 2

here is the answer ......