Black Body Radiation: Does it Occur in a Vacuum?

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SUMMARY

The discussion centers on the phenomenon of black body radiation occurring within a vacuum, specifically in a hollow cuboid with a small hole. It concludes that radiation from the interior surfaces is re-radiated, leading to an increase in temperature until the radiation entering through the hole equals the radiation exiting. The initial radiation is primarily from the wall opposite the hole, and the discussion also touches on the implications of temperature differences in relation to Newton's law of cooling.

PREREQUISITES
  • Understanding of black body radiation principles
  • Familiarity with thermodynamics concepts, particularly heat transfer
  • Knowledge of Newton's law of cooling
  • Basic comprehension of vacuum physics
NEXT STEPS
  • Research the principles of black body radiation in detail
  • Explore thermodynamic laws related to heat transfer in vacuums
  • Study Newton's law of cooling and its applications in thermal systems
  • Investigate the behavior of radiation in enclosed spaces with varying temperatures
USEFUL FOR

Physicists, thermodynamics students, and anyone interested in the principles of heat transfer and radiation in vacuum environments.

Manula
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Consider a hollow cuboid with a small hole on one of it's sides(interior surface is mat black).and let this cuboid be in a vacuum.if we allow a light ray to pass trough this small small hole.

from which surface would the re radiation occur?

Does this happen?
the amount of radiations hitting the interior surface per unit time is re radiated per unit time from the surface.since all the re radiated waves cannot exit trough the hole the temperature inside the cuboid increases until the the amount of radiations leaving trough the hole is equal to the amount of radiations entering trough the hole.

[and also due to the temperature difference between the external surface and the surrounding can the object simply radiate according to Newton's law of cooling.]
 
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That looks good to me. Looks to me like the initial radiation inside the cube would be from the wall opposite the hole.
 

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