MHT CET 2026 Physics question

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

(A)For all wavelengths, power radiated is sameCorrect
(B)For shorter wavelengths, radiated power is more
(C)for longer wavelengths, radiated power is less
(D)All wavelengths are emitted by the black body

Answer: (A)

Solution

A perfect black body at a given temperature emits radiation of all wavelengths (statement D is true), but the energy emitted is not uniform: the spectral distribution rises to a maximum at given by Wien's law, , and falls off on either side. Hence the statement "for all wavelengths,

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Question ID VK-098588