Washington Esthetician State Board Practice Exam

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Study for the Washington Esthetician Exam. Prepare with our multiple choice questions and detailed explanations to ensure you're ready for the exam. Ace your test with our practice tools!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Within the visible spectrum of light, which color has the longest wavelength?

Blue
Green
Red
Yellow

The correct answer is: Red

The color red has the longest wavelength within the visible spectrum of light. The visible spectrum ranges from approximately 380 nanometers (violet) to about 750 nanometers (red). As wavelengths increase, the colors transition from violet to blue, green, yellow, and finally to red. This order reveals that red occupies the upper range of the visible light spectrum, making it distinct. Understanding this aspect of light is crucial for estheticians, as different wavelengths can penetrate the skin to varying depths and affect skin treatments, including light therapies and laser treatments.