Radiation energy is emitted by all the substances, which are above

Related MCQs

• 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
• All substances emit radiation, the quality and quantity depending upon the absolute temperature and the properties of the material composing the radiating body. The above statement is known as the statement of
• All bodies above absolute zero temperature emit radiation". Above statement is based on
• The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit
• The thermal radiation emitted by a body is proportional to T n, where T is its absolute temperature. The value of 'n' is exactly 4 for
• The surface which diffusely reflects and emits the same amount of energy which it receives by radiation is known as
• Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)
• For all substances the absorptivity must lie between
• Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in
• The ratio of the energy absorbed by the body to total energy falling on it is called