Total radiations incident on body = `400 J`, `20%` radiation reflected and `120` J absorbs. Then find out `%` of transmittive power

Out of the radiations falling on surface of a body, 30% radiations are absorebed and 30% are transmitted then its reflection coefficient will be –

If 25% of energy incident on a body is reflected and 55% of energy is absorbed, the energy transmitted is

When q_(1) joules of radiation is incident on a body if reflects and transmits total of q_(2) joules. Find the emissivity of the body.

When q_(1) joules of radiation is incident on a body if reflects and transmits total of q_(2) joules. Find the emissivity of the body.

Out of 10J of radiant energy incident on a surface, the energy absorbed by the surface is 2 J and the energy reflected is 7 J. Then, coefficient of transmission of the body is

Out of 10J of radiant energy incident on a surface, the energy absorbed by the surface is 2 J and the energy reflected is 7 J. Then, coefficient of transmission of the body is

25% absorb, 25 Cal passes out transmits and total incident radiation Q = 500 J Then find out % of reflective power

The ................ of the surface of a body is the ratio of amount of thermal radiations reflected in a given time to the total amount of thermal radiations incident.