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Radiation pressure in classical electromagnetism

According to Maxwells theory of electromagnetism, an electromagnetic plane wave carries momentum, which can be transferred to a reflecting (or absorbing) surface hit by the wave.

The energy flux (intensity) is expressed by the Poynting Vector(S=ExH)whose magnitude we denote by S.S divided by the square of the speed of light in free space is the density of the linear momentum of the electromagnetic field. The time-averaged intensity S divided by the speed of light in free space is the radiation pressure exerted by an electromagnetic wave on the surface of a target, if the wave is completely absorbed.

s c

here,s=Time Average Intensity,c=Speed Of Light.

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