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 s.
