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Q. No.A black body has a maximum wavelength at a temperature of \(2000~\text K.\) Its corresponding wavelength at temperatures of \(3000~\text K\) will be:
| 1. | \(\dfrac{3}{2} \lambda_m\) | 2. | \(\dfrac{2}{3} \lambda_m\) |
| 3. | \(\dfrac{4}{9} \lambda_m\) | 4. | \(\dfrac{9}{4} \lambda_m\) |
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 |
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 graphs correctly represents the variation of \(T?\)
| 1. |  |
2. |  |
| 3. |  |
4. |  |
The plots of intensity versus wavelength for three black bodies at temperatures \(T_1,T_2\) and \(T_3\) respectively are as shown. Their temperatures are such that:
| 1. | \({T}_1>{T}_2>{T}_3 \) | 2. | \({T}_1>{T}_3>{T}_2 \) |
| 3. | \({T}_2>{T}_3>{T}_1 \) | 4. | \({T}_3>{T}_2>{T}_1\) |
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Q. No.
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