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1st Law of Thermodynamics

An iron body ...

Question

An iron body is at room temperature. Now it is heated and due to rise in temperature, it becomes red at high temperature. This phenomenon can be explained by

Stefan's law

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Kirchoff's law

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Wein's displacement law

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Newton's heating law

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Solution

The correct option is C Wein's displacement law
As temperature increases, $λ$ (wavelength) of the maximum intensity decreases. As we move from infrared to visible, first the colour red appears, this concept is related to $λ_{m} . T = c o n s t a n t$ (Wein's displacement law)

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