Question

8. Emission of greenish white light by phosphorus at ordinary
temperature is an example of
a) chemiluminescence,
b) phosphorescence,
c) photoelectric effect
d) quenching of luminescence​

Answer 1

Answer:

A phosphor, most generally, is a substance that exhibits the phenomenon of luminescence; it emits light when exposed to some type of radiant energy. The term is used both for fluorescent or phosphorescent substances which glow on exposure to ultraviolet or visible light, and cathodoluminescent substances which glow when struck by an electron beam (cathode rays) in a cathode ray tube.

Answer 2

Answer:

option.b phosphorescence