Washington Esthetician State Board Practice Exam

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Ultraviolet (UV) rays should be applied at what distance for effective treatment?

12 to 18 inches
24 to 30 inches
30 to 36 inches
36 to 42 inches

The correct answer is: 30 to 36 inches

UV rays should be applied at a distance of 30 to 36 inches for effective treatment because this range maximizes the therapeutic benefits while minimizing the risk of skin damage. UV radiation is commonly used in various aesthetic treatments, such as for skin conditions or to enhance tanning. When applied too closely, the intensity of the UV rays can lead to overexposure, resulting in skin burns or adverse reactions. Conversely, if the source is too far, the effectiveness may be diminished as the rays lose potency over distance, making it less effective for treatment purposes. The range of 30 to 36 inches strikes a balance, ensuring that the UV rays can penetrate the skin effectively while reducing the chances of any negative side effects. This distance is often recommended in professional settings to ensure safe and effective usage of ultraviolet therapy.