A body is called grey if the monochromatic emissivity of the body is___________________?
Correct answer: C. Same for all wavelengths
- A. Zero
- B. Unity
- C. Same for all wavelengths
- D. Different for all wavelengths
Explanation
A grey body has constant monochromatic emissivity over all wavelengths, although its emissivity is less than unity. Wavelength-dependent emissivity describes a non-grey body.
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