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Second Law of Thermodynamics

On increasing...

Question

On increasing the temperature of a substance gradually, which of the following colours will be noticed by you

A

White

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B

Yellow

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C

Green

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D

Red

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Solution

The correct option is D White
White. The temperature of body is at 1600°C.
According to Wien's displacement law, λT = constant. For red, λ is large so temperature is less. For blue temperature is large accordingly.

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