Q. Which of the following waves are also called as heat waves?

[A] UV rays

[B] X-rays

[C] Infrared

[D] Micro waves

Answer: C

Infrared waves vibrate not only the electrons, but entire atoms or molecules of a substance. This vibration increases the internal energy and consequently, the temperature of the substance. Therefore, infrared waves are often called as heat waves.

Source: NCERT