Which of the following is the characteristics of a black body?
Answers
Answer:
a. A perfect conductor
b. A perfect absorber but an imperfect radiator
c. A perfect radiator but an imperfect absorber
d. A perfect radiator and a perfect absorber
Answer :
A black body is an idealized body that absorbs all electromagnetic radiation and re-radiates it as thermal radiation. It has an emissivity of 1, the spectral radiance depends only on temperature, and it follows Wien's and Stefan-Boltzmann's laws. The color temperature is proportional to temperature.
Explanation :
A black body is an idealized physical body that absorbs all electromagnetic radiation that falls onto it and re-radiates the energy as thermal radiation. It does not reflect or transmit any electromagnetic radiation that falls onto it. Some of the characteristics of a black body are:
- Emissivity: A black body has an emissivity of 1, meaning it absorbs all the radiation that falls onto it and re-radiates it.
- Spectral Radiance: The spectral radiance of a black body depends only on its temperature and is described by Planck's law. The spectral radiance increases with temperature, with higher temperatures corresponding to higher radiances in the visible and ultraviolet regions of the spectrum.
- Color Temperature: The color temperature of a black body is proportional to its temperature. At low temperatures, the color is red, while at high temperatures, the color is blue-white.
- Wien's Law: Wien's law states that the wavelength of maximum emission for a black body is inversely proportional to its temperature.
- Stefan-Boltzmann Law: The Stefan-Boltzmann law states that the total power emitted by a black body is proportional to the fourth power of its temperature.
A black body is an idealization and does not exist in reality, but many objects, such as stars, can approximate the behavior of a black body at high temperatures.
To know more about the concept please go through the links :
https://brainly.in/question/33872793
https://brainly.in/question/3046080
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