12-11-2017, 09:05 PM
Engineering physics lab viva questions with answers
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engineering physics lab viva questions with answers
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Engineering physics lab viva questions with answers
14-11-2017, 04:36 PM
1) Declare Stefan's law.
Answer: The amount of thermal radiation emitted per second per unit area of the surface of a black body is directly proportional to the fourth power of the absolute temperature.
2) What is a perfect black body?
Answer: A perfect black body is one that completely absorbs radiation from all wavelength incidents. The absorbance is equal to 1.
3) What is black body radiation?
Answer: A perfect black body is heated to a high temperature, emits radiation consisting of all possible wavelengths. The radiation thus emitted is called blackbody radiation. It is also called total or total radiation.
4) Define the power of emission of a body.
Answer: The emission power of a body at a particular temperature is defined as the total energy radiated per second.
5) Define emissivity.
Answer: Emissivity is defined as the relationship between the emission power of a body and the emission power of a black body at the same temperature.
6) Can a perfect black body be made in practice?
Answer: A perfect black body can not be realized in practice.
7) Name the black body generally used for precise experiment work.
Answer: Black body Ferry designed by Ferry.
8) What is heat radiation?
Answer: The process of transferring heat from one place to another along a straight line without affecting an intermediate medium is called radiation.
9) What is thermal radiation?
Answer:The energy emitted by the body in the form of radiation by virtue of its temperature is called thermal radiation of energy.
10) What is the speed with which thermal radiation travels?
Answer: Thermal radiation travels at a light speed, that is, 3 x 108 m / s.
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