Science, asked by kajaljain2861992, 5 months ago

4. How is time measured by modem watches and clock?

Answers

Answered by radheshyam6441

Answer:

Most clocks and watches today keep time by applying electric energy to a quartz crystal, a system developed in the 1930s. ... Cesium atoms vibrate exactly 9,192,631,770 times a second, driving a clock that is accurate to within a millionth of a second per year.

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