Suggest one way, in each case, by which we can detect the presence of:
(1) Infra-red radiations
(2) Ultraviolet radiations

State one harmful effect each of the (a) ultraviolet and (b) infrared radiations

Name the radiations which can be detected by a thermopile.

Stratosphere contains a stable layer of ozone molecules which absorbs UV radiation from the sun. The presence of ozone in atmosphere serves, as a shield to protect living organism on earth from the harmful effects of the solar ultraviolet radiation. The ultraviolet radiation are known to cause skin cancer. Ozone is formed in stratosphere by the following photochemical reactions. O_(2)(g)overset(UV)rarrO(g)+O(g) O(g)+O_(2)(g)overset(UV)hArrO_(3)(g) Ozone is thormodhynamically unstable and ecomposes to molecular oxygen. Thus a dynamic equilibrium exits between the production and decomposition of ozone molecules. Earth is protected from UV radiation by

Stratosphere contains a stable layer of ozone molecules which absorbs UV radiation from the sun. The presence of ozone in atmosphere serves, as a shield to protect living organism on earth from the harmful effects of the solar ultraviolet radiation. The ultraviolet radiation are known to cause skin cancer. Ozone is formed in stratosphere by the following photochemical reactions. O_(2)(g)overset(UV)rarrO(g)+O(g) O(g)+O_(2)(g)overset(UV)hArrO_(3)(g) Ozone is thormodhynamically unstable and ecomposes to molecular oxygen. Thus a dynamic equilibrium exits between the production and decomposition of ozone molecules. The air pollutant which are responsible to deplete the ozone layer is

Stratosphere contains a stable layer of ozone molecules which absorbs UV radiation from the sun. The presence of ozone in atmosphere serves, as a shield to protect living organism on earth from the harmful effects of the solar ultraviolet radiation. The ultraviolet radiation are known to cause skin cancer. Ozone is formed in stratosphere by the following photochemical reactions. O_(2)(g)overset(UV)rarrO(g)+O(g) O(g)+O_(2)(g)overset(UV)hArrO_(3)(g) Ozone is thormodhynamically unstable and ecomposes to molecular oxygen. Thus a dynamic equilibrium exits between the production and decomposition of ozone molecules. Maximum quantity of ozone is present in

The reagent which can't be used to detect the presence of both CO_(3)^(2-) and HCO_(3)^(-) in a mixture is -

What are ultraviolet radiations ? How are they detected ? State one use of these radiations

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

Statement-1 : Ultrasonics is the acoustic analogue of ultraviolet radiation Statement-2 : Ultraviolet rays do not produce visual sensations while ultrasonic waves are not heards by the human ear.

A radioactive sample is kept at the centre of an evacuated spherical vessel. (a) Out of the alpha , beta and gamma radiations, name the radiations which are (i) safe and (ii) unsafe. (b) Suggest two ways for more safety. ( c) Does evacuation of vessel help in safety ?