Discussion :: Heat and Mass Transfer
- A grey body is one whose absorptivity
|
A.
Varies with temperature |
|
B.
Varies with wavelength of the incident ray |
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C.
Is equal to its emissivity |
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D.
Does not vary with temperature and. wavelength of the incident ray |
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Answer : Option D
Explanation :
A grey body is a body (object) that emits radiation at each wavelength in a constant ratio less than unity to that emitted by a black body at the same temperatures.
A grey body is a physical body whose absorptivity of a surface does not vary with variation in temperature and wavelength of the incident radiation.
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