Classical electromagnetic theory predicted that the energy radiated by a blackbody would became infinite as the wavelength became shorter. What was the contradiction between observation and this result called?

a) A quantum theory.
b) The photoelectric effect.
c) The wave-particle duality.
d) The ultraviolet catastrophe.

d) The ultraviolet catastrophe.

Explanation:

-Ultraviolet catastrophe was a 19th century prediction that an ideal black body at thermal equilibrium will emit radiation in all frequency ranges.

-This Classical electromagnetic theory is also called the Rayleigh–Jeans catastrophe.

answer: the answer is a

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