Thermal energy is a form of which type of radiation?

Thermal energy is a form of which type of radiation?

• A. Electromagnetic
• B. Acoustic
• C. Mechanical
• D. Nuclear

Answer: (A)

Heat can be transferred by radiation, and that radiation is carried by electromagnetic waves. Any object above 0 K emits electromagnetic radiation, with the amount and spectrum increasing with temperature; in everyday ranges this is mainly infrared. This is why heat from the Sun or a fire can reach you through space or across a room without needing a medium. So the radiation associated with thermal energy is electromagnetic radiation. The other terms describe different phenomena—sound waves (acoustic) require a medium, and mechanical or nuclear processes involve different mechanisms or contexts than typical thermal radiation.

Heat can be transferred by radiation, and that radiation is carried by electromagnetic waves. Any object above 0 K emits electromagnetic radiation, with the amount and spectrum increasing with temperature; in everyday ranges this is mainly infrared. This is why heat from the Sun or a fire can reach you through space or across a room without needing a medium. So the radiation associated with thermal energy is electromagnetic radiation. The other terms describe different phenomena—sound waves (acoustic) require a medium, and mechanical or nuclear processes involve different mechanisms or contexts than typical thermal radiation.