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Types of Rays

April 26, 2013

Introduction to types of rays

Electromagnetic rays covers a wide range of wavelengths (or) frequencies. The whole electromagnetic ray  spectrum has been classified into different parts and sub parts, in order of increasing wavelength and type of excitation. All electromagnetic  ray travel with the velocity of light. The physical properties of electromagnetic rays are determined by their wavelength and not by their method of excitation. The overlapping in certain parts of the spectrum shows that the particular wave can be produced by different methods.Lets discuss about the rays and their type.

Different type of rays and their uses

1. Radio waves : These waves are used in radio and television communication systems. AM band is from 530 kHz to 1710 kHz. Higher frequencies upto 54 MHz are used for short waves bands. Television waves range from 54 MHz to 890 MHz. FM band is from 88 MHz to 108 MHz. Cellular phones use radio waves in ultra high frequency (UHF) band.
2. Microwaves : Due to their short wavelengths, they are used in radar communication system. Microwave ovens are an interesting domestic application of these waves.
3. Infra red waves :
(i) Infrared lamps are used in physiotherapy.
(ii) Infrared photographs are used in weather forecasting.
(iii) As infrared radiations are not absorbed by air, thick fog, mist etc, they are used to take photograph of long distance objects.
(iv) Infra red absorption spectrum is used to study the molecular
structure.
4. Visible light : Visible light emitted or reflected from objects around us provides information about the world. The wavelength range of visible light is 4000 Å to 8000 Å.

5. Ultra−violet radiations

(i) They are used to destroy the bacteria and for sterilizing surgical instruments.
(ii) These radiations are used in detection of forged documents, finger prints in forensic laboratories.
(iii) They are used to preserve the food items.
(iv) They help to find the structure of atoms.

6. X rays :
(i) X rays are used as a diagonistic tool in medicine.
(ii) It is used to study the crystal structure in solids.

7. γ−rays : Study of γ rays gives useful information about the nuclear structure and it is used for treatment of cancer.

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