Physics questions
20027 published questions with worked solutions.
- If between wavelength and + d , e_ and a_ be the emissive and absorptive powers of a body and E_ be the emissive power of a...
- Distribution of energy in the spectrum of a black-body can be correctly represented by
- The Kirchhoff's law leads to the conclusion that the good radiators of thermal radiations are
- If E is emissive power and 'a' is the coefficient of absorption of a body at any temperature, E_b is the emissive power of a...
- Kirchhoffs law leads to the conclusion that the good radiators of thermal radiations are:
- Who propounded the hypothesis that exchange of heat radiation takes place between the bodies at all temperature?
- Which of the following law states that _m is inversely proportional to absolute temperature?
- Two bodies one hot and the other cold are kept in vacuum. What will happen to the temperature of the hot body after some time? :
- A body which absorbs all the radiations incident over it is called a :
- A good absorber of heat is a good radiator of heat also is :
- The temperature at which a black body ceases radiated energy is
- When two bodies are under thermal equilibrium then
- According to Prevost's theory, every object
- Prevost's theory of heat exchange is not applicable at temperature
- For a body slightly above the room temperature, the rate of loss of heat depends upon
- Who proposed the hypothesis that exchange of radiation takes place between the bodies of all temperature?
- According to Prevost's theory of exchanges
- The dimensions of Stefan's constant are
- The amount of radiation emitted by a perfectly black body is proportional to
- The amount of heat energy radiated per second by a surface depends upon