The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as_________________?

Related Mcqs:

Heat flowing from one side to other depends directly on ___________________?

Pick up the wrong case? A. face area B. time C. thickness D. temperature difference E. thermal conductivity...

Thermal diffusivity of a substance is ____________________?

A. proportional of thermal conductivity B. inversely proportional to k C. proportional to (k) D. inversely proportional to k2 E. none of the above...

A grey body is one whose absorptivity_________________?

A. varies with temperature B. varies with wavelength of the incident ray C. is equal to its emissivity D. does not vary with temperature and. wavelength of the incident ray E. none of the above...

All radiations in a black body are___________________?

A. reflected B. refracted C. transmitted D. absorbed E. partly reflected and partly absorbed...

Absorptivity of a body will be equal to its emissivity___________________?

A. at all temperatures B. at one particular temperature C. when system is under thermal equi-librium D. at critical temperature E. for a polished body...