PSI Barbering Practice Exam

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Study for the PSI Barbering Exam. Engage with multiple choice questions and flashcards that offer hints and explanations for each question. Prepare effectively for your licensure with our resources!

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

  1. Red light

  2. Green light

  3. Ultraviolet

  4. 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.

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