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If the absorption of electromagnetic radiation by matter results in the emission of radiation of the same or longer wavelengths for a long time, the phenomenon is termed as which of the following?

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If the absorption of electromagnetic radiation by matter results in the emission of radiation of the same or longer wavelengths for a long time, the phenomenon is termed as which of the following?

(a) Luminescence

(b) Fluorescence

(c) Phosphorescence

(d) Spontaneous emission

This question was addressed to me in homework.

My question comes from X-Ray Fluorescence Spectrometry topic in division X-Ray Spectrometers of Analytical Instrumentation

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The correct option is (c) Phosphorescence

The explanation: If the absorption of electromagnetic radiation by matter results in the emission of radiation of the same or longer wavelengths for a long time, the phenomenon is termed as phosphorescence. Phosphorescence is a type of luminescence.

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