Q. 263.9( 7 Votes )

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 :

The correct answer is (d). An atomic clock is based on the characteristic frequencies of radiation emitted by atoms of certain elements which have a precision of about 1s in 3 x 105 years. However, a wall clock can measure correctly up to one second, a stop watch can measure correctly about a fraction of a second and digital clock can also measure correctly up to about a fraction of second.


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