For all substances the absorptivity must lie between

Related MCQs

• Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity?
• According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a
• "The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium". This is __________ law.
• 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)
• 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.)
• Absorptivity of a body will be equal to its emissivity
• A grey body is one whose absorptivity
• The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation.