Question

In thermal radiation, thermal energy is converted to ___________________

(a) kinetic energy

(b) potential energy

(c) electromagnetic energy

(d) thermal energy

I had been asked this question during an online exam.

Question is taken from Heat Radiation topic in division Heat Transfer Theory of Food Processing Unit Operations

Answer 1

The correct answer is (c) electromagnetic energy

To explain I would say: In thermal radiation, thermal energy is converted to electromagnetic energy. This is achieved by the thermal motion of the particles in the substance. All the substance with a temperature greater than absolute zero emits the thermal radiation. The motion of the particle results in acceleration of charge and dipole oscillation which produces electromagnetic energy.