A black body has a maximum wavelength at a temperature of 2000 K. Its corresponding wavelength at temperatures of 3000 K will be:

 1 $${3 \over 2} \lambda_m$$ 2 $${2 \over 3} \lambda_m$$ 3 $${4 \over 9} \lambda_m$$ 4 $${9 \over 4} \lambda_m$$
Subtopic:  Wien's Displacement Law |
86%
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A piece of iron is heated in a flame. If it becomes dull red first, then becomes reddish yellow, and finally turns to white hot, the correct explanation for the above observation is possible by using:

 1 Stefan's law 2 Wien's displacement law 3 Kirchhoff's law 4 Newton's law of cooling
Subtopic:  Wien's Displacement Law |
81%
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If ${\lambda }_{m}$ is the wavelength, corresponding to which the radiant intensity of a block is at its maximum and its absolute temperature is T, then which of the following graph correctly represents the variation of T?

 1 2 3 4

Subtopic:  Wien's Displacement Law |
74%
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The plots of intensity versus wavelength for three black bodies at temperatures ${\mathrm{T}}_{1}$${\mathrm{T}}_{2}$ and ${\mathrm{T}}_{3}$ respectively are as shown. Their temperatures are such that:

 1 $$\mathrm{T}_1>\mathrm{T}_2>\mathrm{T}_3$$ 2 $$\mathrm{T}_1>\mathrm{T}_3>\mathrm{T}_2$$ 3 $$\mathrm{T}_2>\mathrm{T}_3>\mathrm{T}_1$$ 4 $$\mathrm{T}_3>\mathrm{T}_2>\mathrm{T}_1$$
Subtopic:  Wien's Displacement Law |
63%
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