Blackbody Radiation as a Puzzle for Classical Physics
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Heated objects emit a continuous range of wavelengths whose peak shifts to shorter wavelengths as temperature rises, a pattern classical physics could not predict.
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A metal rod glows dull red when moderately hot and shifts toward white as it heats further, its peak wavelength moving shorter.
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Classical theory's failure was severe: it predicted infinite intensity at short wavelengths, an impossible result.