Absorptivity of a body is equal to its emissivity – McqOptions

MCQOPTIONS

1.	Absorptivity of a body is equal to its emissivity
A.	For a polished body
B.	Under thermal equilibrium
C.	At one particular temperature
D.	At shorter wave lengths
Answer» C. At one particular temperature

Discussion

No Comment Found

Related MCQs

Which type of fuel is removed from the reactor core after reaching end of core life service?
Solar radiation received at any point of earth is called ______________
The scattered solar radiation is called ____________
Solar radiation which reaches the surface without scattering or absorbed is called _____________
Complete the following reaction. H2O + CO2 → _______
Oil is estimated to last for ________ more.
If 5 radiation shields are placed between two parallel plates, the rate of radiation heat transfer is reduced to:[ε = 1 for all surfaces]
A fraction of radiative energy leaving one surface that strikes the other surface is called
A satellite floats in deep space with very high velocity. It will continuously lose heat by
A radiator on a space capsule must dissipate heat generated inside the capsule, by radiating it into space. While on the bright side of the earth, the capsule sees the earth’s radiation and solar radiation. The radiator surface has a solar absorptivity of 0.5 and an emissivity of 0.9. What is the maximum equilibrium surface temperature of the radiator, if the maximum heat generated in the capsule is 800 W/m2?Assume earth’s radiation = 100 W/m2 and solar irradiation = 524 W/m2.Take Stefan Boltzmann constant as 5 × 10-8 W/m2-K4