Does radiation pressure depend on the speed of the object?

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SUMMARY

Radiation pressure is directly proportional to energy flux and inversely proportional to the speed of light. The energy received by a surface does depend on the speed of the object, particularly when considering the Doppler effect, which causes red-shifting as an object moves away from a light source. This red-shifting results in a loss of energy for the object. Therefore, while energy is influenced by speed, the relationship is nuanced and involves the effects of light propagation.

PREREQUISITES
  • Understanding of radiation pressure concepts
  • Familiarity with energy flux and its calculations
  • Knowledge of the Doppler effect in physics
  • Basic principles of light speed and its constancy
NEXT STEPS
  • Study the principles of radiation pressure in detail
  • Explore the Doppler effect and its implications in astrophysics
  • Learn about energy flux calculations in different contexts
  • Investigate the effects of red-shifting on energy loss in moving objects
USEFUL FOR

Physics students, astrophysicists, and anyone interested in the interactions between light and moving objects will benefit from this discussion.

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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