what happens when hot and cold radiations meet?

Question

in fact i need something which happens when a hot object and a cold object meet....its an invisible thing

Answer 1

Heat can be transfered in three ways:

Radiation: All objects radiate electromagnetic energy. Hot objects radiate more than cold ones (radiation is proportional to the absolute kelvin temp to the fourth). Therefore, if a hot object and a cold object (the sky on a cloudless night is an extremely cold object) radiate at each other, the hot one will give up energy and the cold one will gain it.

Conduction: When objects with different temperatures (or a thermal gradient) touch each other, the thermal energy of the molecules bouncing around is directly transfered. The net transfer goes from hot to cold.

Convection: An object with thermal energy (like the air or a hot rock) can be moved physically through space (by wind or by you or whatever), thereby transfering the energy along with it.

Answer 2

hey !
there r no hot or cold radiations ...there are only thermal radiations
but when a hot and a cold object meet ,a thermal equilibrium is established ,that is, heat flows from the hot body to the cold body until both the bodies have the same temprature,afterwhich dynamic eqilibrium is observed.

eg. working of a thermometer

Answer 3

A heat gradient is established causing heat transfer. The steeper the gradient, the faster the transfer.