State any one source of ultraviolet radiations.

The luminous flux of a 1 W sodium vapour lamp is more than that of a 10 kW source of ultraviolet radiation. Comment.

The source of ultraviolet light is :

State two applications of ultraviolet radiation.

Name three properties of ultraviolet radiations which are similar to visible light

State any one use of infrared radiations.

The most harmful of ultraviolet radiations are

The air of earth's atmosphere responsible for absorbing a large portion of ultraviolet radiations by the sun is

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

Select the correct arrangement of the types of ultraviolet radiations according to the intensity of their effect on human skin

Assertion : Ozone in the troposphere is a product of ultraviolet radiations acting on dioxygen molecules. Reason : Ozone is thermodynamically very stable.