Uses of electromagnetic spectrum
The following are some of the uses of electromagnetic waves.
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.
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.
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.
(i) X rays are used as a diagonistic tool in medicine.
(ii) It is used to study the crystal structure in solids.