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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 or a short 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 or a short 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 by my school principal while I was bunking the class.

This is a very interesting question from X-Ray Fluorescence Spectrometry in portion X-Ray Spectrometers of Analytical Instrumentation

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The correct choice is (a) Luminescence

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

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