What is a gray body? - Heat Transfer

Q.  What is a gray body?
- Published on 11 Aug 15

a. a body of which the monochromatic emissivity (ε) is different wavelengths
b. a body of which the monochromatic emissivity (ε) is constant for the entire wavelength spectrum
c. a body of which the monochromatic emissivity (ε) is maximum for longest wavelength
d. none of the above

ANSWER: a body of which the monochromatic emissivity (ε) is constant for the entire wavelength spectrum

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