Does radiation pressure depend on the speed of the object?

AI Thread Summary
Radiation pressure is proportional to energy flux and inversely proportional to the speed of light, indicating that the energy received by a surface does depend on the object's speed. However, while energy is related to speed, it is affected by the Doppler effect; if an object moves away from a light source, the light becomes red-shifted, resulting in a loss of energy. Consequently, the relationship between energy and speed is not straightforward, as moving away from a light source alters the energy received. Thus, while speed influences energy, the effect is nuanced due to the nature of light and motion. Understanding these dynamics is crucial in discussions of radiation pressure and energy transfer.
vertyu
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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?
 
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Welcome to PF!

Hi vertyu! Welcome to PF! :smile:
vertyu said:
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?

Sort-of.

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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