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Question

Which of the following time measuring device is most precise?

A
A wall clock
B
A stop watch
C
A digital watch
D
An atomic clock
Solution
Verified by Toppr

Correct option is D. An atomic clock
The least count of a wall clock, stop watch, digital watch and atomic clock are $$1 \ sec$$, $$\dfrac{1}{10} \ sec$$, $$\dfrac{1}{100} \ sec$$ and $$\dfrac{1}{10^{11}} \ sec$$ respectively. So atomic clock is most precise.

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