The arranged array of electromagnetic radiations in the sequence of their wavelength or frequency is called electromagnetic spectrum.
Electromagnetic spectrum (consists of EM waves of all frequencies). They are:
1. Radio waves (biggest wavelength, smallest frequency)
2. Microwaves
3. Infrared waves
4. visible light (ROY G BIV)
5. Ultraviolet light
6. X-rays
7. Gamma rays (smallest wavelength, highest frequency)
Uses of electromagnetic waves:
Radio and microwaves are used in radio and TV communication.
Infrared rays are used to
(a) Treat muscular strain
(b) For taking photographs in fog or smoke
(c) In green house to keep plants warm
(d) In weather forecasting through infrared photography
Ultraviolet rays are used
(a) In the study of molecular structure.
(b) In sterilizing the surgical instruments.
(c) In the detection of forged documents, finger prints.
X-rays are used
(a) In detecting faults, cracks, flaws and holes in metal products.
(b) In the study of crystal structure.
(c) For the detection of pearls in oysters.
Gamma rays are used for the study of nuclear structure.
