Black Body Radiation: Does it Occur in a Vacuum?

In summary, when a hollow cuboid with a small hole on one of its sides is placed in a vacuum, a light ray passing through the hole would cause re radiation from the interior surface. This re radiation occurs because the amount of radiations hitting the interior surface per unit time is equal to the amount of radiations being re radiated per unit time from the surface. As a result, the temperature inside the cuboid increases until the amount of radiations leaving through the hole is the same as the amount of radiations entering through the hole. Additionally, due to the temperature difference between the external surface and the surrounding, the object may also radiate according to Newton's law of cooling.
  • #1
Manula
28
0
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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  • #2
That looks good to me. Looks to me like the initial radiation inside the cube would be from the wall opposite the hole.
 

FAQ: Black Body Radiation: Does it Occur in a Vacuum?

What is black body radiation?

Black body radiation is the thermal electromagnetic radiation emitted by an object due to its temperature. It is called "black body" because it absorbs all radiation that falls on it, and reflects none.

Does black body radiation occur in a vacuum?

Yes, black body radiation does occur in a vacuum. In fact, black body radiation is often studied in a vacuum to eliminate any interference from other sources of radiation.

How does black body radiation differ from other types of radiation?

Unlike other types of radiation, black body radiation is not dependent on the material of the object emitting it. It is solely determined by the temperature of the object.

What is the relationship between temperature and black body radiation?

The amount and frequency distribution of black body radiation is directly proportional to the temperature of the object. As the temperature increases, the intensity and frequency of the radiation also increase.

What is the significance of black body radiation in science?

Black body radiation is a fundamental concept in physics and has been used to validate many theories, such as quantum mechanics and the theory of relativity. It also has practical applications, such as in thermal imaging and understanding the behavior of stars and planets.

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