If emissivity of bodies X and Y are `e_(x)` and `e_(y)` and absorptive powers are `A_(x)` and `A_(y)` then

Relation between emissivity e and absorptive power a is (for black body)

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

In a compound A_(x)B_(y) :

If x,y,z are in A.P.and A_(1) is the A.M.of x and y and A_(2) is the A.M.of y and z, then prove that the A.M.of A_(1) and A_(2)isy.

If at temperature T , the emissive power and absorption power of a body for wave length are e_(lambda) and a_(lambda) respectively, then-

If at temperature T , the emissive power and absorption power of a body for wave length are e_(lambda) and a_(lambda) respectively, then-