- 1(current)
Q. No.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. | \({9 \over 4} \lambda_m\) |
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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 |
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If 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. |  |
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The plots of intensity versus wavelength for three black bodies at temperatures , and 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. | \(\mathrm{T}_3>\mathrm{T}_2>\mathrm{T}_1\) |
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- 1(current)
Q. No.
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