time
absorptive power
The absorptive power of a body is defined as the ratio of the energy absorbed for a given time to the energy incident on it for the same amount of time. It measures the amount of heat absorbed by an object. Since, a black body absorbs all the incident energy, its absorptive power is 1.
all of the above
The term radiation is applied to the kinds of processes which transmit energy by means of electromagnetic waves. The amount of radiation mainly depends upon the nature of body, temperature of the body and type of surface of the body.
when the radiations are falling on a body, three things happen, i.e. a part of the radiations are absorbed by the body, a part of the radiations are reflected and the remaining radiations are transmitted through the body.
all of the above
The emissive power of a body depends upon its
* temperature
* physical nature
* wave length