- 1(current)
Q. No.Radiation energy corresponding to the temperature T of the sun is E. If its temperature is doubled, then its radiation energy will be:
1. 32 E
2. 16 E
3. 8 E
4. 4 E
1. \(1:4\)
2. \(3:1\)
3. \(1:2\)
4. \(6:1\)
| 1. | \((300)^1\) | 2. | \((300)^2\) |
| 3. | \((300)^3\) | 4. | \((300)^4\) |
A black body is at \(727^\circ\text{C}.\) The rate at which it emits energy is proportional to:
| 1. | \((727)^2\) | 2. | \((1000)^4\) |
| 3. | \((1000)^2\) | 4. | \((727)^4\) |
1. \(100\)
2. \(200\)
3. \(400\)
4. \(800\)
| 1. | \(\left(\dfrac{\alpha}{\sigma \times 4 \pi R^2}\right)^{\dfrac{1}{4}} \) | 2. | \(\left(\dfrac{\sigma \times 4 \pi R^2}{\alpha}\right)^{\dfrac{1}{4}}\) |
| 3. | \(\left(\dfrac{\alpha}{\sigma \times 4 \pi R^2}\right)\) | 4. | \(\left(\dfrac{4 \pi R^2 \times \sigma}{\alpha}\right)\) |
Two bodies A and B have thermal emissivities of 0.01 and 0.81 respectively. The outer surface areas of the two bodies are the same. The two bodies emit total radiant power at the same rate. The wavelength of B corresponding to maximum spectral radiancy in the radiation differs from that of A by 1.00 µm. If the temperature of A is 5802 K:
1. the temperature of B is 17406 K.
2. = 1.5 µm
3. the temperature of B is 11604 K.
4. the temperature of B is 2901 K.
1. increases by a factor of \(16\)
2. decreases by a factor of \(4\)
3. remains constant
4. increases by a factor of \(4\)
- 1(current)
Q. No.
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