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Laws of the Radiation of Heat

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-255

2025-12-27

513

1.  Radiation takes place through a vacuum as well as in the air. This results from the nature of the radiation, for the medium by means of which the radiation takes place is the ether and not the air. If this law were not true, we should receive no heat from the sun and but little from the bulb. of an incandescent lamp.
2.  Radiation in a vacuum or in a homogeneous substance takes place in straight lines. A homogeneous substance is one that has the same physical structure throughout.
3. The intensity of radiant heat is proportional to the temperature of the source.

The intensity is inversely proportional to the square of the distance from the source.