For non-black bodies,the range of values of emissivity 'e is -

A black body emits

A black body does not .

In Ferry's black body, the area of black body is

If for a black body the graph of change is emissive power at different temperatures T_1, T_2 and T_3 with wavelength is according to the figure then –

The black body have

A black body at 127^(@)C emits the energy at the rate of 10^(6)J//m^(2) s the temperature of a black body at which the rate of energy emission is 16 xx 10^(6)J//m^(2)s is .

Coefficient of emission or emissivity (e) is defined as

Energy is being emitted from the surface of a black body at 127∘ C temperature at the rate of,1.0times10^(6)J/sec-m^(2) .Temperature of the black body at which the rate of energy emission is 16.0times10^(6)J/sec-m^(2) will be