Question

(a) Why are infra-red radiations referred to as heat waves? Name the radiations which are next to these radiations in the electromagnetic spectrum having (i) shorter wavelength (ii) longer wavelength. 

Answer 1

(a) Infrared waves are produced by hot bodies and molecules, so are referred to as heat waves. 

(i) Em wave having short wavelength than infrared waves are visible, UV, γ-rays and γ-rays. 

(ii) Em wave having longer wavelength than infrared waves are microwaves, short radio waves, television and FM radio.