Michigan Esthetician State Board Practice Exam

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Prepare for the Michigan Esthetician State Board Test. Study with flashcards and multiple choice questions, each question includes hints and explanations. Get equipped for your exam!

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Which type of ultraviolet rays is most intense at reaching the Earth's surface?

The correct answer is: UVB

The type of ultraviolet rays that is most intense at reaching the Earth's surface is UVB. These rays have a shorter wavelength than UVA rays and a higher energy level, making them more potent in terms of their biological effects on the skin. UVB radiation is primarily responsible for causing sunburns and is directly linked to the development of skin cancer, as it penetrates the top layer of the skin effectively. UVA rays, although they are the most prevalent type of UV radiation reaching the Earth, do not carry as much energy as UVB and primarily contribute to aging and long-term skin damage rather than immediate reactions like sunburn. UVC rays, on the other hand, are mostly absorbed by the Earth's atmosphere and do not reach the surface in significant amounts, which is why they are not a concern for skin exposure under normal circumstances. The term UVR encompasses all ultraviolet radiation, but it does not specify a particular type that is most intense; hence, it is less precise compared to simply identifying UVB.