16.Write short notes on radiative heat transfer.
17.State Stefan Boltzmann law.
18.What is the relationship between absorptivity, reflectivity and transmissivity?
19.State Kirchhoff’s law
20. List any four properties of black body
Answers
1)Radiation is the process in which energetic particles or energetic waves travel through a medium or space. Radiation is the energy transfer across a system boundary due to a ΔT, by the mechanism of photon emission or electromagnetic wave emission.
2)Stefan-Boltzmann law, statement that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature. ... The law applies only to blackbodies, theoretical surfaces that absorb all incident heat radiation.
3) in the attachment.
4)Kirchhoff's circuit laws are two equalities that deal with the current and potential difference in the lumped element model of electrical circuits.
5) (a) it is the surface that emits most for a given temperature and wavelength, (b) blackbody radiation does not depend on the direction, that is, blackbody radiation is diffuse, and (c) total blackbody radiation in a vacuum depends only on temperature.
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Stefan-Boltzmann law, statement that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature. The law applies only to blackbodies, theoretical surfaces that absorb all incident heat radiation.