The least count of a stop watch is (1/ 513635221 second. The time of 20 oscillations of a +20 pendulum is measured to be 25 seconds. The 25 25 maximum percentage error in the measurement of time period will
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The least count is 1/5 sec.
Time taken = 25 sec
Percentage error -= least count/time taken * 100
= 100/125
=4/5
= 0.8
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