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Prompt emission of X-ray by an atom ionised by a higher energy X-ray is a type of which of the following phenomena?

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Prompt emission of X-ray by an atom ionised by a higher energy X-ray is a type of which of the following phenomena?

(a) Luminescence

(b) Fluorescence

(c) Phosphorescence

(d) Spontaneous emission

This question was posed to me by my college director while I was bunking the class.

The query is from X-Ray Fluorescence Spectrometry topic in portion X-Ray Spectrometers of Analytical Instrumentation

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Right option is (b) Fluorescence

Explanation: Prompt emission of X-ray by an atom ionised by a higher energy X-ray is a type of fluorescence. Fluorescence emissions are characteristic of the particular element.

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