Sci & Tech : Mobile Technology Generations

Telecommunications have grown leaps and bounds from telephones to portable radio phones to cellular phones( first generation to fifth Generation). The below document gives an overview about all the generations.

Generations of mobile wireless technology pdf download

SCi & Tech : Electromagnetic Spectrum

The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation. The other types of EM radiation that make up the electromagnetic spectrum are microwaves, infrared light, ultraviolet light, X-rays and gamma-rays.