Calculate the amount of heat radiated per second by a body of surface area `12cm^(2)` kept in thermal equilibrium in a room at temperature `20^(@)C` The emissivity of the surface `=0.80` and `sigma=6.0xx10^(-s)Wm^(-2)K^(-4)` .

Calculate the amount of heat radiated per second by a body of surface area 12 cm^2 kept in thermal equilibrium in a room at temperature 20°C . The emissivity of the surface = 0.80 and sigma = 6.0 × 10^-8 W m^-2 K^-4

Calculate the amount of heat radiated per second by a body of surface are 10 cm^(2) kept in thermal equilibrium in a roomat temperature 27^(@)C . The emissivity of the surface = 0.80 and Stefan's constant sigma ~= 6 xx 10^(-8) W//m^(2) K^(4)

A room heater is made up of thin wall tubes of copper, each 1.0 m long and 4.0 cm in diameter. Hot water aet 77^(@)C circulates constantlyh through the tubes. Calculate the amount of heat radiated per second in a room where the average temperature is 27^(@)C . The emissivity of copper =0.8 and Stefan's contant =5.67xx10^(-8)Wm^(-2)K^(-1)

A room heater is made up of thin wall tubes of copper, each 1.0 m long and 4.0 cm in diameter. Hot water aet 77^(@)C circulates constantlyh through the tubes. Calculate the amount of heat radiated per second in a room where the average temperature is 27^(@)C . The emissivity of copper =0.8 and Stefan's contant =5.67xx10^(-8)Wm^(-2)K^(-1)

The power of black body at temperature 200 K is 544 W .Its surface area is (sigma=5.67xx10^(-8)Wm^(-2)K^(-2))

Calculate the power of an incandescent lamp whose filament has a surface area of 0.19 cm^(2) and is at a temperature of 3645K. Emmisivity of the surface is 0.4, sigma = 5.7xx10^(-8)Wm^(-2)K^(-4) ?

A body having a surface area of 5.0" cm"^(2) , radiates 300 J of energy per minute at a temperature of 727^(@)C . The emissivity of the body is (Stefan.s constant =5.67xx10^(-8)W//m^(2)//K^(4) )

Calculate the energy radiated per minute by a black body of surface area 200 cm^(2) , maintained at 127^(@) C. sigma = 5.7xx10^(-8)Wm^(-2)K^(-4)

The power of a black body at temperature 200K is 544 watt. Its surface area is (sigma = 5.67 xx 10^(-8) wm^(-2) K^(-4))

Calcualte the maximum amount of heat which may be lost per second by radiation from a sphere of 10 cm in diameter and at a temperature of 227^(@) C when placed in an encloser at a temperature of 27^(@) C. sigma = 5.7xx10^(-8)Wm^(-2)K^(-4) .