Which of the following time measuring devices is most precise?
(a) A wallclock
(b) A stop watch
(c) A digital watch
(d) An atomic clock
Given reason for your answer.
Option (d) is correct because a clock can measure time correctly up to one second. A stop watch can measure time correctly up to a fraction of a
second. A digital watch can measure time up to a fraction of second whereas an atomic clock is the most accurate timekeeper and is based on
characteristic frequencies of radiation emitted by certain atoms having precision of about 1 second in 300,000 years. So an atomic clock can
measure time most precisely as precision of this clock is about 1 s in 1013 s.
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