? Radiation. Radiation. How does heat energy get from the Sun to the Earth?
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1 How does heat energy get from the Sun to the Earth? Radiation There are no particles between the Sun and the Earth so it can not travel by conduction or by convection.? Radiation
2 Radiation Thermal radiation is the energy emitted by a substances because of its temperature. All solid bodies as well as liquid and gases have a tendency of radiating thermal energy in the form of electromagnetic waves according to Maxwell wave theory or in the form of discrete photons according to Max Plank s theory and absorbing similar energy emerging from the neighbouring bodies. This type of heat transport is known as thermal radiation.
3 Radiation OR Radiation is a process by which heat flows from a high temperature body to a body at lower temperature in the form of electromagnetic waves when the bodies are separated in space even when a vacuum exists between them (when the bodies are not in direct physical contact with each other). Regardless of the form of substance (solid, liquid or gas) the emission of energy is due to change in electron configuration of the constituent molecules.
4 Radiation While the transfer of energy by conduction or convection requires presence of material medium, radiation does not. The radiation heat transfer is more efficient in vacuum. Thermal radiation occurs in the region of wavelengths 0.1 μm to 100 μm on electromagnetic spectrum.
5 Radiation There will be a continuous interchange of energy between two radiating bodies, with a net exchange of energy from the hotter to the colder body. Heat transfer through radiation The source of energy can be far away No material medium is require for heat transfer. At ordinary temperature, the energy transferred by radiation can be neglected.
6 Radiation The heat energy from the sun is radiated to us.
7 What type of surface is the best absorber of heat
8 Test Yourselves 1. Brightly polished kettle do not lose much energy by radiation. Why? Silvery surface is the worst radiator of heat 2. The cooling fins on the back of a refrigerator, in a car radiator should be dull black. Why?
9 Application of Radiation Cooling fins at the back of a refrigerator is rough and painted in black. A black and rough surface is a good radiator of heat. The motor of the refrigerator can be cooled down quickly by the cooling fins.
10 Teapot Application of Radiation has smooth, shiny and silvery surface. Smooth, shiny and silvery surface is a bad radiator of heat. This reduces rate of heat loss. Tea or coffee can be kept warm in the teapot.
11 White paint for houses Application of Radiation In hot countries, houses are painted in white to reduce absorption of heat energy from the Sun
12 Application of Radiation
13 Application of Radiation
14 A vacuum Flask is used to keep hot water hot or keep icecream cold. Vacuum Flask
15 Vacuum Flask It is a double-walled glass bottle. The space between the two walls is a vacuum. This can stop energy transfer out by conduction and convection. It cannot stops radiation, as radiation can takes place in the vacuum.
16 Vacuum Flask The shiny bright silvering surface on glass wall reduces heat loss by radiation. Cork stopper which is made of poor conductors reduces heat loss by conduction and convection
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