Emission of visible light by a material when exposed to ultraviolet radiation is known as?

Emission of visible light by a material when exposed to ultraviolet radiation is known as?

• A. Foss
• B. Fluorescence
• C. Finish
• D. Fire

Answer: (B)

Fluorescence is the emission of visible light by a material when it’s illuminated with ultraviolet radiation. When UV photons strike the material, electrons get excited to higher energy levels and quickly drop back down, releasing some of that energy as visible light. The glow starts as soon as the UV light is on and stops almost immediately when the UV is removed. This instant, UV-driven glow is what sets fluorescence apart from other phenomena. For example, phosphorescence glows after the light is off, while terms like finish or fire describe surface coatings or combustion, not light emission caused by UV exposure.

Fluorescence is the emission of visible light by a material when it’s illuminated with ultraviolet radiation. When UV photons strike the material, electrons get excited to higher energy levels and quickly drop back down, releasing some of that energy as visible light. The glow starts as soon as the UV light is on and stops almost immediately when the UV is removed. This instant, UV-driven glow is what sets fluorescence apart from other phenomena. For example, phosphorescence glows after the light is off, while terms like finish or fire describe surface coatings or combustion, not light emission caused by UV exposure.