A perfect black body

The total radiation emitted by a perfectly black body is proportional to

What is the emissivity of a perfectly black body?What is meant by absorving power?

A spherical black body with radius 12 cm radiates 450 W power at 500K,If the radius were halved and the temperature doubled,the power radiated in watt would be

What is the relation between the emissivity and absorbing power of a black body?

The temperature of a black body increases from 7°C to 287°C .The rate of energy radiation increases by

Calculate the amount of radiation of a black body at 400K temperature. (sigma= 5.67 xx 10^-8 watt//m^2 //k^4)

State true or false A perfect cube does not end with two zeros.

What is a black body?

What is black body and write Stefan's law.

What is black body radiation and photoelectric effect?