Question

How does the atomic clock measures the time?

Answer 1

An atomic clock is a device that measures time using the microwave signal emitted by atoms – or the electrons in atoms – when they change energy levels.

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Answer 2

Explanation:

Atomic clocks measure the actual length of a second, which is the base unit we use to calculate time. According to the International System of Units (SI), the time unit "second" is calculated by the time an atom in a defined state - comprised of the element caesium-133 - takes to oscillate 9,192,631,770 times.

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