Physics, 12.02.2020 07:32 tamera62

Describe briefly difference between conduction, convection, and radiation.

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Answer from: smarty5187

The three types of heat transfer are conduction convection and radiation. Explanation:

Heat transfer happens only when there is said to be a temperature difference. (i.e) heat transfer occurs with a higher temperature region to a lower temperature region. Heat is transferred usually via some medium in the case of convection and conduction whereas in the radiation no medium is required ( i.e it take place in a vacuum ). Conduction is a type of heat transfer that is mainly a character for the conducting and semiconducting solid material. Convection is the heat transfer method that usually takes place in the liquids and gases. Radiation is the heat transfer process in which heat is transferred via infrared or electromagnetic waves.

Answer from: Quest

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Answer from: Quest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

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Describe briefly difference between conduction, convection, and radiation.
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