MHT CET 2022 Physics question

About a black body radiation, which one of the following is the WRONG statement?

(A)All wavelengths are emitted by a black body
(B)For longer wavelengths, intensity is less
(C)For shorter wavelength, intensity is more
(D)For all wavelengths, intensity is sameCorrect

Answer: (D)

Solution

A black body emits a continuous spectrum containing all wavelengths, so (A) is correct. The spectral intensity is not uniform: it rises from zero at very small wavelengths, reaches a maximum at (Wien's law, constant) and then falls off at longer wavelengths, so intensity varies strongly

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Question ID VK-097056