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Which of the following time measuring de...

Which of the following time measuring devices is most precise ? (a) A wall clock. (b) A stop watch. (c ) A digital watch. (d) An atomic clock. Give reason for you answer.

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A wall clock may meaure correctly upto wathc may measure fraction of a second. A digital wathc may measure some fraction of a second. An atomic clock is the most precise time measuring device as atomic oscillators are repected with a precision of `1 s in 10^(13) s.`
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