- 1(current)
Q. No.A spherical black body with a radius of \(12~\text{cm}\) radiates \(450~\text W\) power at \(500~\text K.\) If the radius were halved and the temperature is doubled, the power radiated in watts would be:
1. \(450\)
2. \(1000\)
3. \(1800\)
4. \(225\)
1. \(450\)
2. \(1000\)
3. \(1800\)
4. \(225\)
Subtopic: Â Radiation |
 75%
Level 2: 60%+
NEET - 2017
Hints
We consider the radiation emitted by the human body. Which of the following statements is true:
| 1. | The radiation emitted is in the infrared region |
| 2. | The radiation is emitted only during the day |
| 3. | The radiation is emitted during the summers and absorbed during the winters |
| 4. | The radiation emitted lies in the ultraviolet region and hence is not visible |
Subtopic: Â Radiation |
 66%
Level 2: 60%+
AIPMT - 2003
Hints
Which of the following is closest to an ideal black body?
| 1. | Black lamp |
| 2. | Cavity maintained at a constant temperature |
| 3. | Platinum black |
| 4. | A lump of charcoal heated to high temperature |
Subtopic: Â Radiation |
 56%
Level 3: 35%-60%
AIPMT - 2002
Hints
- 1(current)
Q. No.
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