Question

What is radiation ?????????

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Answer 1

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$\huge\bold\red{{Radiation:-}}$

The process of the transfer of heat from one place to another place without heating the intervening medium is called radiation. The term radiation used here is another word for electromagnetic waves. These waves are formed due to the superposition of electric and magnetic fields perpendicular to each other and carry energy.

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Additional information~

Properties of Radiation

(a) All objects emit radiations simply because their temperature is above absolute zero, and all objects absorb some of the radiation that falls on them from other objects.

(b) Maxwell on the basis of his electromagnetic theory proved that all radiations are electromagnetic waves and their sources are vibrations of charged particles in atoms and molecules.

(c) More radiations are emitted at a higher temperature of a body and lesser at a lower temperature.

(d) The wavelength corresponding to maximum emission of radiations shifts from longer wavelength to shorter wavelength as the temperature increases. Due to this, the colour of a body appears to be changing. Radiations from a body at NTP has predominantly infrared waves.

(e) Thermal radiations travel with the speed of light and move in a straight line.

(f) Radiations are electromagnetic waves and can also travel through a vacuum.

(g) Similar to light, thermal radiations can be reflected, refracted, diffracted and polarized.

(h) Radiation from a point source obeys inverse square law $(intensity\:a\:1/{r}^{2})$

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Answer 2

Answer:

It is a process of transferring heat without a conventional medium...

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