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Which of the following time measuring devices is most precise? A wall clock. (a) A stop watch.  (b) A digital watch.

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Which of the following time measuring devices is most precise? A wall clock.

(a) A stop watch. 

(b) A digital watch. 

(c) An atomic clock.

Give reason for you answer.

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An atomic clock is the most precise time measuring device because atomic oscillations are repeated with a precision of 1s in 1013s.

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