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11th Class Physics Physical World / भौतिक जगत

  • question_answer 57)
                      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 your answer                

    Answer:

                      (d) Accuracy of atomic clock is 1 part in \[{{10}^{13}}\]                


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