In radiative heat transfer, a gray
surface is one
Which appears gray to the eye
Whose emissivity is independent of wave length
Which has reflexivity equal to zero
Which appears equally bright from all
directions
Whose emissivity is independent of wave length
Gray body :When the emissivity of the
non-black surface is constant at all temperature and throughout the entire
range of wavelength the surface is called a gray body.
A gray surface is one whose emissivity
is independent of wavelength is monochromatic emissivity.
Hence, the correct option is (B).
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