According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?

Related Mcqs:

Which of the following is the case of heat transfer by radiation ___________________?

A. blast furnace B. heating of building C. cooling of parts in furnace D. heat received by a person from fireplace E. all of the above...

Thermal conductivity of a material may be defined as the________________?

A. quantity of heat flowing in one second through one cm cube of material when opposite faces ^re maintained at a temperature difference of 1°C B. quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C … Thermal conductivity of a material may be defined as the________________?Read More...

Emissivity of a white polished body in comparison to a black body is________________?

A. higher B. lower C. same D. depends upon the shape of body E. none of the above...

The value of Prandtl number for air is about _______________________?

A. 0.1 B. 0.3 C. 0.7 D. 1.7 E. 10.5...

40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?

A. 0.45 B. 0.55 C. 0.40 D. 0.75 E. 0.60...