USES OF ELECTROMAGNETIC WAVES

USES OF ELECTROMAGNETIC WAVES

The following are some of the uses of electromagnetic waves

1. Radio waves are used in radio and T.V. communication systems.

2. Microwaves are used in microwave oven.

3. Infrared radiations are used

(a) in revealing the secret writings on the ancient walls

(b) in green houses to keep
the plants warm

(c) in warfare, for looking through haze, fog
or mist as these radiations can pass through them.

4. Ultraviolet radiations are used in the detection of invisible writing, forged documents, finger prints in forensic
laboratory and to preserve the food stuffs.

5. The study of infrared, visible and ultraviolet radiations help us to know through spectra, the structure of the molecules and arrangement of electrons in the external shells.



6. X-rays can pass through flesh and blood but not through bones. This property of X-rays is used in medical diagnosis, after X-rays photographs are made.
The study of X-rays has revealed the atomic structure and crystal structure.

7. The study of g-rays provides us valueable information about the structure of the atomic nuclei.

8. Super high frequency electromagnetic waves (3000 to 30,000 MHz) are used in radar and satellite communication.

9. Electromagnetic waves (frequency 50 to 60 Hz) are ued for lighting. These are weak waves having wavelength 5 × 106 to 6 × 106 m and can be produced from A.C. circuits.