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Physics
Which of the following time measuring devices is most precise ?
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Q. Which of the following time measuring devices is most precise ?
Physical World, Units and Measurements
A
A wall clock
5%
B
An atomic clock
81%
C
A digital watch
7%
D
A stop watch
7%
Solution:
An atomic clock is the most precise time measuring device because atomic oscillations are repeated with a precision of $1 \,s$ in $10^{13}\, s$.