Ncert Exercises & Solutions

26. Which of the following time measuring devices is most precise:

(a) A wall clock
(b) A stopwatch
(c)A digital watch
(d) An atomic clock

Give the reason for your answer.

Hint: The instrument with the lowest least count is the most precise instrument.

Step 1: Find the instrument with the lowest least count.

A wall clock can measure time correctly for up to one second. A stopwatch can measure time correctly up to a fraction of a second. A digital watch can measure time up to a fraction of a second. An atomic clock can measure time most precisely as its precision is 1s in

10^{13}

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