What is the main natural source of ultraviolet radiation?, UV lamps, The Sun, Welding arcs, Tanning beds, X-rays are made up of:, Electrons, Protons, High-energy photons, Neutrons, Which is an artificial source of X-rays?, X-ray machines in hospitals, Supernovae, Stars, The Sun, Gamma rays have:, The longest wavelength, No energy, The lowest energy, The shortest wavelength and the highest energy, Which category of UV radiation is generally more harmful?, UVA, UVB, UVC, Visible light, X-rays are produced when:, Atoms freeze, Electrons are accelerated or suddenly slowed down, Water evaporates, Sound waves travel, Gamma rays are produced when:, Water boils, An unstable atomic nucleus changes into a more stable nucleus, Wind moves, Plants grow.

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