Mention two applications of infrared radiation.

Mention three properties of infrared radiations similar to visible light.

Mention the applications of beats,

State two applications of ultraviolet radiation.

Mention two applications of electrolysis .

State any one use of infrared radiations.

State two applications of echo.

Give two properties of infrared radiations which differ from visible light.

Give one use each of (a) microwaves, (b) ultraviolet radiations, (c) infrared radiations, and (d) gamma rays.

(i) Why the thin ozone layer on the top of the atmosphere is crucial for human survival ? Identify in which part of electromagnetic spectrum does this radiation belong and write an important application of this radiation. (ii) Why are infrared waves referred to as heat waves ? How are they produced ? What role do they play in maintaining earth.s warmth through the greenhouse effect ?

Mention two functions of human skin