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Chapter 7: Problem 27

Is it possible for a fluorescent material to emit radiation in the ultraviolet region after absorbing visible light? Explain your answer.

Short Answer

Expert verified
No, it is not possible for a fluorescent material to emit radiation in the ultraviolet region after absorbing visible light. Fluorescence involves emission of light of a longer wavelength, and thus lower energy, than the absorbed light. Since ultraviolet light has higher energy than visible light, after absorbing visible light, the fluorescent material can only emit light of equal or longer wavelength than the visible range, not shorter like ultraviolet.

Step by step solution

01

Understanding Fluorescence

Fluorescence occurs when a material absorbs light or other electromagnetic radiation of a different wavelength and then emits light of a longer wavelength and lower energy. Exactly which wavelengths are absorbed and emitted depends on the specific material.
02

Understanding Energy Levels of Visible Light and Ultraviolet Light

Visible light is of lower energy compared to ultraviolet light. When a material absorbs light, it cannot emit light of a higher energy (shorter wavelength or frequency) than it absorbed.
03

Application to the Problem

The question asks if it is possible for a fluorescent material to absorb visible light and emit ultraviolet radiation. From the information stated above, it is clear that a material cannot emit a higher energy light than it absorbed. Therefore, a fluorescent material that absorbs visible light cannot emit ultraviolet radiation, because ultraviolet light is of higher energy than visible light.

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