What is the absorptivity of a black body?

Related MCQs

• Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity?
• Depending on the radiating properties, a body will be black when (where a = absorptivity, p == reflectivity, X = transmissivity.)
• Absorptivity and reflectivity of a perfect black body are respectively
• In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)
• The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body).
• 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
• If the absorptivity plus reflectivity of a body equals 1, then the body is known as
• 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
• A grey body is one whose absorptivity
• Depending on the radiating properties, a body will be white when (where a = absorptivity, p = reflectivity, x = transmissivity)