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Q.

The [[1]] watch is used for measuring very short intervals of time accurately.

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Detailed Solution

The Atomic watch is used for measuring very short intervals of time accurately.
Atomic clocks are the most precise time and frequency standards now in use. They are the main standards for global navigation satellite systems like GPS, television broadcast wave frequencies, and for worldwide time distribution services. Extremely brief intervals of

1 0^{- 9}

seconds are measured by atomic clocks and watches (nanoseconds).

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