PSI Barbering Practice Exam

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Study for the PSI Barbering Exam. Prepare yourself with multiple choice questions and detailed explanations designed to help you succeed. Build your confidence and knowledge as you get ready for your licensing exam in the barbering profession!

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What type of light has the shortest wavelength in the visible spectrum?

Red light
Green light
Ultraviolet
Blue light

The correct answer is: Ultraviolet

The option indicating ultraviolet light is correct because ultraviolet (UV) light exists just beyond the visible spectrum and has wavelengths shorter than visible light. The visible spectrum ranges from approximately 380 nm to 750 nm, with violet light having the shortest wavelength within that range. Ultraviolet light falls below 380 nm, making it the type of light with the shortest wavelength when compared to any visible colors like red, green, or blue light. Red light has the longest wavelength within the visible spectrum, followed by green and then blue light, which are all longer than that of ultraviolet. Thus, ultraviolet is indeed the light type that possesses the shortest wavelength.