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Homework Help: About radiation pressure

  1. Jun 22, 2009 #1
    Since radion pressure in proportional to energy flux and inversely proportional the speed of light, does that mean that energy received by the surface depends on the speed of the object. Since the distance of travel is proportional to speed, and force * distance = energy, the energy depends on the speed of the object. Is that correct?
  2. jcsd
  3. Jun 23, 2009 #2


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    Welcome to PF!

    Hi vertyu! Welcome to PF! :smile:

    Yes, the energy does depend on the speed of the object, but not in quite the way you've written it …

    light always moves at the same speed, but if the object moves away from the light, it'll be red-shifted, and that will make it lose energy! :smile:

    (Similarly, if you're moving away from a hot star, the star will be redder and less hot.)
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