Question

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.

Answer 1

A wall clock may meaure correctly upto wathc may measure fraction of a second. A digital wathc may measure some fraction of a second. An atomic clock is the most precise time measuring device as atomic oscillators are repected with a precision of `1 s in 10^(13) s.`