JEE Main 2003 Physics question

The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by

(1)Rayleigh Jeans law
(2)Planck's law of radiation
(3)Stefan's law of radiation
(4)Wien's lawCorrect

Answer: (4)

Solution

Wien's displacement law, m K, fixes where the earth's emission peaks: for K, m, which lies in the infra-red region; this is the law the question intends, option (4).

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Question ID VK-038087