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Taking into account the radiation that a human body emits which of the following statements is true?
| 1. | The radiation is emitted only during the day. |
| 2. | The radiation is emitted during the summers and absorbed during the winters. |
| 3. | The radiation emitted lies in the ultraviolet region and hence is not visible. |
| 4. | The radiation emitted is in the infra-red region. |
Subtopic: Â Radiation |
 61%
Level 2: 60%+
Hints
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
The shapes of the black body radiation curves depend on their:
1. Masses
2. Surface areas
3. Materials
4. Temperatures
1. Masses
2. Surface areas
3. Materials
4. Temperatures
Subtopic: Â Radiation |
 63%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
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