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Least count of a stop watch is 0.2 sec. The time of 20 oscillations of a pendulum is measured to be 25 sec. The max % error in measurement is:

Respuesta :

The time measured is 25 seconds. The error in the measurement is 0.2 seconds. The % error is therefore 
(0.2/25)x100 = 0.8%. 

The period of one oscillation is 25/20=1.25 seconds. The error in the period is 0.8/100 x 1.25 = 0.01 second. 
 
ie period = 1.25 +/- 0.01 s.

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