LASER is an acronym for light amplification by.

Stimulated energetic radiation

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Spontaneous emission of radiation

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Stimulated emission of radiation

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Spontaneous emission of radio waves

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Solution

The correct option is C Stimulated emission of radiation
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".

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For photoelectric emission, tungsten requires light of $2300 \circ A$ . If light of $1800 \circ A$ wavelength is incident then emission

˚ A

˚ A

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