Question

An object is oscillating about certain mean position.
Its time period of oscillation is being measured by
a stop watch of least count 0.1 s. For 20 oscillations the time noted down is 40.0 s. Then
fractional error in measurement of time period of oscillation is -
a) 1/20
b) 1/400
c) 1/200
d) 1/40​

Answer 1

Explanation:

Stop watch measure in 10oscillation =20±0.1sec

Error =±0.1 in 10 oscillation

Error/oscillation=±

10

0.1

=±0.01

% error in time period =0.01×100=1%