No body is perfect

Perfect cube

At 273^(@)C ,the emissive power of a perfect black body is R . What is its value 0^(@)C ?

What is thermal conductivity of a perfect heat conductors of a perfect heat conductor and a perfect heat insulator?

If the emissive power of a certain body at a certain temperature is 2000 W//m^(2) and the emissive power of a perfect blackbody at the same temperature is 10000 W//m^(2) , what is the coefficient of emission of the body ?

cube root of a perfect even cube is ___________and the perfect odd cube is ______________

mu ={Two digit perfect squases for which sum of digits is a perfect square } Y={Two digit perfect squases for which sum of digits is a perfect square } Find (X cup Y)