Electromagnetic Radiation

The electromagnetic spectrum has electromagnetic waves ranging from 103m-1012m.

• It includes radio waves, microwaves, infrared, visible region, UV,X-rays and gamma rays.
• Electromagnetic wave with maximum wavelength – Radio waves.
• Waves used for communication through satellites – Micro wave.

X-rays

• X-rays are electro magnetic waves with shorter wavelength.
• X-rays were discovered by Rongen.
• It is used to study the internal atomic structure of crystals.
• Hard X-rays are of higher frequencies with more penetrating power than soft X-rays.
•  Hard X-rays are used in radiations and the treatment of cancer as it penetrates into the body tissues.
• Soft X-rays are used in the photography of internal parts such as chest and bone.
• The rays which appears to be originated from outside of the earth is called Cosmic rays.
• Cosmic rays were discovered by Victor Hess.

Infrared rays

• Was discovered by William Herschel.
• Used in T.V. remotes.
• Used in distant photography.
• The heat of the sunlight is due to – Infrared rays.

Ultraviolet rays

• Used for detecting the adulterations in ghee and is also used for identifying the counterfeit currency.
• They causes sun burn.
• UV ray is used to disinfect equipments used for operations.
• It is used to fill inside the tube light.