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What is the fundamental assumption that Wien's displacement law makes about a black body?
It radiates all frequencies with equal intensity
It absorbs all incident light and reflects none
It radiates more lower frequencies than higher
It has a temperature equal to absolute zero
Answer
A black body is an ideal object that absorbs all incident light and reflects none. Wien's displacement law states that the wavelength of the peak of the black-body radiation curve is inversely proportional to the temperature of the body. In other words, the hotter the body, the shorter the wavelength of the peak of its black-body radiation curve.
Wonderful Wilhelm Wien: A Journey through the Life of a Visionary Physicist
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