Emissivity and absorptivity of a surface are equal for radiation

Related MCQs

• The statement that the emissivity and absorptivity of a surface is surrounded by its own temperature are the same for both monochromatic and total radiation, is known as
• In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)
• The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by
• Absorptivity of a body will be equal to its emissivity
• The absorptivity of a body is equal to its emissivity
• The emissivity of a body will be equal to absorptivity when
• When a body is in thermal equilibrium with its surroundings, the absorptivity and the emissivity of the body are same. This Law is known as
• Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity?
• The rate of radiant energy, which is emitted by a surface at any temperature and in small wavelength is found from the known rate of energy, which under the same condition would be emitted from a black surface by multiplying with the absorptivity. Above enunciation is known as
• 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is