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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

A
Stefan's law
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B
Kirchoff's law
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C
Wein's displacement law
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D
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 λm.T=constant (Wein's displacement law)

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