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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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Atomic clock is the most precise with precision of 1 part in `10^(13)`, i.e. the atomic oscillations of an atomic clock are repeated with a precision of 1s in `10^(13)s`.
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MODERN PUBLICATION-UNITS AND MEASUREMENT-NCERT FILE (EXEMPLAR PROBLEMS SUBJECTIVE QUESTIONS)
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