PSI Barbering Practice Exam

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Which type of ultraviolet rays are used in germicidal irradiation?

UVA rays
UVB rays
UVC rays
Visible light rays

The correct answer is: UVC rays

UVC rays are utilized in germicidal irradiation primarily because they have the shortest wavelength (100-280 nm) and are highly effective at destroying bacteria, viruses, and other pathogens. This specific range of ultraviolet light is capable of breaking down the DNA and RNA of microorganisms, rendering them unable to replicate and causing cell death. While UVA and UVB rays are types of ultraviolet light, their wavelengths are longer and less effective for sterilization purposes. UVA rays (320-400 nm) penetrate the skin more deeply and can contribute to skin aging and cancer but do not have significant germicidal properties. UVB rays (280-320 nm) primarily affect the outer skin layers and are responsible for sunburns but are not as effective as UVC rays in killing microbes. Visible light rays are not a form of ultraviolet radiation and therefore do not possess germicidal qualities. UVC's ability to effectively sanitize and disinfect environments makes it an essential tool in various applications, such as water treatment, surface disinfection, and air purification, showcasing its unique role in germicidal efficacy.