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The least count of a stop watch is 1/5 s...

The least count of a stop watch is 1/5 second. The time of 20 oscillations of a pendulum is measured to be 25 seconds. The maximum percentage error in the measurement of time will be

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Verified by Experts

Error in measuring 25 sec.=0.2sec.
`therefore "percenta error" =(0.2)(25)xx100=0.8%`
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