Which of the following statement is correct about heat transfer?

Question

RRB Paper · Accepted Answer

Kirchhoff’s law of thermal radiation states that the emissivity of a body is equal to its absorptivity when the body remains in thermal equilibrium with its surrounding.

Note:- A blackbody allows all incident radiation to pass into it (no reflected energy) and internally absorbs all the incident radiation (no energy transmitted through the body).

Which of the following statement is correct about heat transfer?

A grey body is one that absorbs all radiations incident on it

At thermal equilibrium

the emissivity and absorptivity are the same

The energy absorbed by a body to the total energy falling on it is called emissivity

A perfect body is one that is black in color

The correct answer is `No. 2: At thermal equilibrium`

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Which of the following statement is correct about heat transfer?

A grey body is one that absorbs all radiations incident on it

At thermal equilibrium

the emissivity and absorptivity are the same

The energy absorbed by a body to the total energy falling on it is called emissivity

A perfect body is one that is black in color

The correct answer is No. 2: At thermal equilibrium

The correct answer is `No. 2: At thermal equilibrium`