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Absorption and Emission Multiple Questions and Answers.
Exercise Questions ::
Kinetic Theory of Gases
6. In order that the heat flows from one part of a solid to another part, what is required? A. Uniform density B. Temperature gradient C. Density gradient D. Uniform temperature
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Answer: Option B
Explanation:
As heat flows from higher temperature to lower temperature, so a temperature gradient is required.
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7. Mud houses are cooler in summer and warmer in winter because? A. Mud is a good conductor of heat B. Mud is a superconductor of heat C. Mud is a bad conductor of heat D. Mud can adapt according to temperature
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Answer: Option C
Explanation:
Mud is an ad conductor of heat. It does not allow heat to come in from outside in summer and it does not allow heat to go out from a house in winter.
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Answer: Option A
Explanation:
A black body is one which absorbs the entire radiation incident upon it. Its absorptive power is unity.
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9. A black body at 200 K is found to emit maximum energy at a wavelength 14μm. When its temperature is raised to 1000K, then wavelength at which maximum energy emitted it? A. 14mm B. 7μm C. 2.8μm D. 28mm
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Answer: Option C
Explanation:
By Wien’s law,‘ ‘ =2.8μm.
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Answer: Option B
Explanation:
Triple point of water corresponds to a temperature of 273.16K and a pressure of 0.46cm of Hg.
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