What happens when a hot body and cold body are kept in contact with each other?
Thermal energy is moved from hot spots to cold spots by convection. Convection happens when hotter territories of a fluid or gas ascend to cooler regions in the fluid or gas. Cooler fluid or gas at that point replaces the hotter territories which have ascended higher. This outcomes in a continuous flow design.
What is the temperature of a dead person?
The average living human being has a body temperature of 98.6 degrees F. However when a person dies, their body begins to cool, at a rate of about 1-2 degrees every hour. Eventually, the body’s temperature will equal the room’s ambient temperature.
In which process the rate of heat transfer is maximum?
The rate of heat transfer is maximum in radiation in form of electromagnetic radiations.
Which is not a method of transfer of heat?
Answer. Explanation: also convection is only posible in fluid where the particles can move easily and the rate of convective heat transfer depends on the rate of flow to a great extend . in solids the particles can rigid and cannot move So, heat is not transferred by the process of convection solids.
What is the speed of heat radiation in vacuum?
It depends on the specific conductor you’re using. At some point, in a vacuum, the electrons have to be excited enough to spit out photons, which are Electromagnetic radiation, which in a vacuum should go on forever at the speed of light theoretically.
What are good absorbers of heat?
The good absorbers of heat are good-emitters of heat. This is based on Kirchhoff’s radiation law. The law states that at a given temperature the coefficient of absorption of a body is equal to its coefficient of emission. A black body is an example of a good absorber of heat as well as a good emitter of heat.
Can thermal radiation travel through a vacuum?
Unlike conduction and convection, radiation does not need matter to transfer heat. Energy is radiated from the sun, through the vacuum of space at the speed of light. Some of it passes through and heats up the atoms on the earth’s surface. Some will even be absorbed by your skin.