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

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0.1 %

8 %

1.8 %

0.8 %

answer is D.

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Detailed Solution

The error in measurement of 25 seconds is 15∴ error in measurement of time = 1525×100=0.8%

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