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 reason for your answer.

Answers (1)

The least counts of the devices are as follows-

Wall clock = 1 sec

Stopwatch = \frac{1}{10} sec

Digital watch = \frac{1}{100} sec &

Atomic clock = \frac{1}{10^{13}} sec.

Hence, the atomic clock is the most precise.

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