Is an Ideal Black Body Visible?

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SUMMARY

An ideal black body is not visible unless its temperature is sufficiently high to emit visible light. The discussion highlights that a cold black body would be imperceptible to the human eye. The example of a hole in an oven is provided as a practical illustration of an ideal black body, which absorbs all light and reflects none, emitting light corresponding to the oven's average temperature. The visibility of a black body is directly linked to its thermal emission characteristics.

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  • Understanding of thermal radiation principles
  • Knowledge of black body radiation concepts
  • Familiarity with Planck's law of radiation
  • Basic physics of temperature and light emission
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  • Explore the concept of emissivity and its impact on visibility
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Physicists, engineers, and students interested in thermodynamics, optical physics, and the principles of thermal radiation.

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Would an ideal black body be visible to us?

What about Ferry's black body? How close was it to an ideal black body?
 
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Swetasuria said:
Would an ideal black body be visible to us?

It depends on it's temperature. In case of a cold black body we would see that we do not see it.
 
You can certainly see an ideal black body as long as its temperature is high enough to emit visible light.

The most common example of an ideal black body is a hole on an oven. The hole absorbs all light and reflects no light (because it is a hole, not a real surface) and the light that comes out is the average temperature of the oven.
 

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