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Which of the following is used in atomic clocks?

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Which of the following is used in atomic clocks?

(a) Laser

(b) Quartz

(c) Maser

(d) Helium

This question was posed to me by my school principal while I was bunking the class.

The above asked question is from Laser topic in division Laser of Engineering Physics II

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Correct answer is (c) Maser

Easy explanation: Before laser maser was used. It stood for microwave amplification by stimulated emission of radiation. This was based on Albert Einstein’s principle of stimulated emission. It was used in the atomic clock.

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