Thermal Propert...

The ratio of radiant energies radiated per unit surface area by two bodies is 16 : 1, the temperature of hotter body is 1000 K, then the temperature of colder body will be

If the initial temperatures of metallic sphere and disc, of the mass, radius and nature are equal, then the ratio of their rate of cooling in same environment will be

When the body has the same temperature as that of surroundings

Two identical objects A and B are at temperatures T_A and T_B respectively. Both objects are placed in a room with perfectly absorbing walls maintained at temperatures T(T_A > T > T_B). The objects A and B attain temperature T eventually. Which one of the following is correct statement?

A black body of surface area 10 cm² is heated to 127^oC and is suspended in a room at temperature 27^oC. The initial rate of loss of heat from the body at the room temperature will be

A body of area 1 cm² is heated to a temperature 1000 K. The amount of energy radiated by the body in 1 s is (Stefan\'s constant σ = 5.67 × 10^–8 Wm^–2 – K⁴)

Three very large plates of same area are kept parallel and close to each other. They are considered as ideal black surfaces and have very high thermal conductivity. The first and third plates are maintained at temperatures 2T and 3T respectively. The temperature of the middle plate under steady state condition is

A bucket full of hot water cools from 75^oC to 70^oC in time T₁, from 70^oC to 65^oC in time T₂ and from 65^oC to 60^oC in time T₃, then

Consider two hot bodies B₁ and B₂ which have temperature 100^oC and 80^oC respectively at t = 0. The temperature of the surrounding is 40^oC. The ratio of the respective rates of cooling R₁ and R₂ of these two bodies at t = 0 will be

Newton\'s law of cooling is a special case of