Explain the Radiation ?
- 1 Answers
- 1512 Views
- I also Faced
- E-Mail Answers
Answer / raghavendra tripathi
It is the transfer of heat from a hot body to a cooler body without appreciably heating the intervening space.
Experimentally it has been proved that
(i)A good radiator is a good absorber and a poor reflector.
(ii)And a bad radiator is a bad absorber and a good reflector
Laws of Radiation
1. The rate of loss of heat by a body radiation process is directly proportional to its difference of temperature over that of its surroundings
2. The amount of heat radiated per second depends upon the are and nature of the radiating surface
3. All bodies at all temperatures radiate heat and also absorb radiated heat from the surrounding
4. Heat radiations obey various light law. They are reflected, refracted, diffused and polarised
Application:
1. White clothes are preferred in summer as white cloth absorbs very little of heat from sun and reflect most of the heat. Coloured cloths are preffered in winter as they absorb most of heat
2. An electric radiators, polished metals are used as they are food reflectors
3. Articles which are required to retain heat are polished from outside so as to have less heat radiations
4. Milk is heated in unglazed earthen vessles in villages to have less heat radiations
| Is This Answer Correct ? | 0 Yes | 0 No |
Explain optical telescopes?
Why is it easy to turn over a leaf with a wet finger ?
When a glass cylinder is filled with water and a piece of thick paper is placed at the mouth and the cylinder is inverted, the paper dies not fall. Why ?
Which property of sound is affected by change in air temperature?
Explain planck’s hypothesis or what the postulates of planck’s quantum theory? (Or) what are the assumptions of quantum theory of black body radiation? : quantum physics
Which element has the lowest melting point?
What is a Diamond ?
X-Ray is avoided by using ?
when taken to the top of a mountain, a clock will go fast or go slow or no change or stop ?
How many types of wave motions are there?
When gravity is the only force acting on an object the object is in what?
Explain what is cardiac output?
General Physics 
