A(n) absorbs energy and then emits electromagnetic radiation based on its . Classical physics predicted that at a high enough temperature, light would be emitted. Instead, white light was emitted, resulting in the ultraviolet . The photoelectric effect occurs when light shining on a metal creates a(n) . However, only light of a certain minimum causes electrons to flow. Gas atoms excited by an electric current emit bands of colors of light in a(n) . Each narrow band of light is associated with of a specific energy.

atom, frequency, ultraviolet, catastrophe, electric current, frequency, spectrum, photons.

Blackbody radiator, temperature, ultraviolet, catastrophe, electric current, frequency, spectrum, photons

Explanation:

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1 and 2 ) A blackbody radiator is an object that absorbs energy, then emits electromagnetic radiation based on the temperature of the object. This comes directly from the definition in the passages.

3 and 4 ) Ultraviolet catastrophe describes when old physicists assumed as frequency increased the waves would go from visible to ultraviolet because that is what comes next on the spectrum. Instead of this happening, the light became white light and it was an apparent 'catastrophe'