A) infra-red (IR)
B) ultraviolet rays
D) gama rays
Correct Answer: B
Solution :[b] Ultraviolet (UV) light is an electromagnetic radiation with a wavelength from 400 nm (750 THz) to 10 nm (30 PHz), shorter than that of visible light but longer than X-rays. Suntan, freckling and sunburn are familiar effects of over- exposure, along with higher risk of skin cancer. Living things on dry land would be severely damaged by ultraviolet radiation from the sun if most of it were not filtered out by the Earth's atmosphere, particularly the ozone layer.
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