Heat is incident at the rate of 10 W on an opaque body having an emissivity of 0.8. Find the quantity of radiant heat reflected by it in 1 minute.

Heat energy is incident on the surface at the rate of 1000 J/min. If coefficient of absorption is 0.8 and coefficient of reflection is 0.1 then heat energy transmitted by the surface in 5 minute is

Radiant energy is incident on the body at a rate of 1500 J//min . If coefficient of emission of a body is 0.9 and coefficient of reflection is 0.06. Find the radiant energy:- the radiant energy transmitted by the body in 7minutes.

Radiant energy is incident on the body at a rate of 1500 J//min . If coefficient of emission of a body is 0.9 and coefficient of reflection is 0.06. Find the radiant energy:- reflected.

Radiant energy is incident on the body at a rate of 1500 J//min . If coefficient of emission of a body is 0.9 and coefficient of reflection is 0.06. Find the radiant energy:- absorbed.

The coefficient of absorption and reflection on the surface of the thin plate are 0.74 and 0.22, respectively. If 184 calories of radiant heat is incident on the surface of the plate, find the quantities of heat absorbed, reflected, and transmitted.

The coefficient of absorption of a surface is 0.6. When radiant energy is incident on the surface at 1500 J//min , the energy reflected in 5 minutes is 450 J. Find the coefficient of reflection and transmission of the surface.

A 100 watt filament loses all its power by radiation when it is heated to a temperature of 2500 K. If the diameter of the filament is 0.2 mm and the surface emissivity of the filament is 0.5, find the length of the filament. (Stefan's constant sigma = 5.67 xx10^-8 W/m^2k^4 )

A 100 watt filament loses all its power by radiation, when it is heated to a temperature 2500 K. If the diameter of the filament is 0.2mm and emissivity of the filament is 0.5, find the length of the filament to ( sigma = 5.67 xx 10^-8 J//m^2sK^4 )

A copper sphere has a surface area of 3.142 xx 10^-2m^2 and its emissivity is 0.018. Find the energy lost by the sphere per second when its temperature is 100^@C . ( sigma = 5.67 xx 10^-8 W/m^2k^4 .)

The coefficient of absorption and reflection of the surface of a body are 0. 75 and 0.20 respectively. If 200 calorie of radiant heat is incident on the surface of the body, then the beat absorbed is