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