46) The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

Answer is:

intensity of radiation

Heat transfer MCQ with Answers

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47) Emissivity of a white polished body in comparison to a black body is

Answer is:

lower

48) A grey body is one whose absorptivity

Answer is:

is equal to its emissivity

Explanation:

A grey body is defined as one whose absorptivity of a surface does not vary with temperature and wavelength of the incident radiation. In other words, if the ratio of emission of a body to that of a black body at a given temperature is constant for all wavelengths, then the body is called a grey body.