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

Related MCQs

• All bodies above absolute zero temperature emit radiation". Above statement is based on
• Depending on the radiating properties, a body will be white when (where a = absorptivity, p = reflectivity, x = transmissivity)
• Depending on the radiating properties, a body will be black when (where a = absorptivity, p == reflectivity, X = transmissivity.)
• Depending on the radiating properties, a body will be opaque when (where a = absorptivity, p = reflectivity, X = transmissivity.)
• Depending on the radiating properties, body will be transparent when
• The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoff‟s law.
• Radiation energy is emitted by all the substances, which are above
• Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K)
• 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 radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m2 . The flux, when the element temperature is increased to 1000°C for the same furnace temperature is