Question

Describe two methods to detect the presence of heat radiations.

Answer 1

The presence of heat radiations can be felt on the human skin. It's example is: on a hot day we feel too much hot, it's only due to heat radiations from Sun. Heat radiations are electromagnetic radiations lying in either visible range or infrared range. So heat radiation can also be detected by infrared detector, there are two main dectectors in it thermal and photonic.