The wavelength of ultraviolet radiations which is most powerful and causes damage to the DNA is .
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A.
UV-A
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B.
UV-D
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C.
UV-B
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D.
UV-C
Correct Answer:
C. UV-B
Explanation:
UV-B radiation, with a wavelength range of 280 to 315 nanometers, is the most biologically damaging form of ultraviolet light to reach the Earth's surface. It is particularly harmful because its energy levels are specifically absorbed by DNA molecules, leading to structural mutations and potential cellular malfunctions. While UV-C is technically more energetic, it is almost entirely filtered out by the ozone layer, leaving UV-B as the primary driver of DNA damage and skin-related health issues.
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