For a perfectly black body, its abosrpitve power is

What is perfectly black body ?

For perfectly black body emissivity (e) is

For perfectly black body emissivity (e) is

These question consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five responses. Assertion: Emissive power of a perfectly black body is one. Reason: Absorptive power of perfectly black body is one.

If between wavelength lambda and lambda + dlambda , e_(lambda) and a_(lambda) be the emissive and absorptive powers of a body and E_(lambda) be the emissive power of a perfectly black body, then according to Kirchoff's law, which is true

If between wavelength lambda and lambda + dlambda , e_(lambda) and a_(lambda) be the emissive and absorptive powers of a body and E_(lambda) be the emissive power of a perfectly black body, then according to Kirchoff's law, which is true

Radiation||Perfectly black body||Absorptive power||Emissive power