Question

Why is infrared radiation also known as heat radiation? Mention its source.

Answer 1

Infrared radiation is known as heat radiation because it produces a strong heating effect when it falls on an object. Its rays are easily absorbed by the molecules of the matter, which increases their thermal energy and raises the temperature of the object.

The ultimate and most powerful natural source of infrared radiation is the Sun. Additionally, any hot body or object - such as a room heater, a burning candle flame, glowing coal, or even the human body - serves as a source of this radiation.