Question

Thermal radiation is described as a two-step process. Which of the following correctly identifies both steps in the correct order?

Options

• Absorption of EM waves → emission of thermal energy

• Conversion of thermal energy → EM waves, then reconversion of EM waves → thermal energy

• Conduction of heat → emission of EM waves

• Reflection of EM waves → absorption of thermal energy

Answer 1

Conversion of thermal energy → EM waves, then reconversion of EM waves → thermal energy

Explanation:

In radiation, a hot body first converts its thermal energy into electromagnetic waves (emission). When these waves strike a cold body, they are reconverted into thermal energy (absorption), raising the temperature of the cold body.