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2Â¥2017-05-06 09:34:22
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4Â¥2017-09-25 23:22:24
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Ïê¼û´ËÍøÕ¾£ºhttps://en.wikipedia.org/wiki/Radiation_pressure Radiation pressure by absorption (using classical electromagnetism: waves)[edit] Main article: Poynting vector According to Maxwell's theory of electromagnetism, an electromagnetic 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 {\displaystyle \mathbf {S} =\mathbf {E} \times \mathbf {H} } \mathbf{S} = \mathbf{E}\times\mathbf{H}, 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 {\displaystyle \langle \mathbf {S} \rangle } \langle\mathbf{S}\rangle 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: |
5Â¥2017-09-26 00:23:55














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