Radio waves are a type of electromagnetic (EM) radiation with wavelengths in the electromagnetic spectrum longer than infrared light. They have have frequencies from 300 GHz to as low as 3 kHz, and corresponding ...
Ellen Chambers - 11/09/2018When video cassette recorders hit the market, video surveillance really hit its stride. Analog technology using taped video cassette recordings meant surveillance could be preserved on tape as evidence. The ...
Ellen Chambers - 11/09/2018Internet is a network of networks that connects millions of Computers to form a network and communicating with each other for sharing resources. You can get information, access data, communicate with others, shop, ...
Ellen Chambers - 11/09/2018We underestimate the computing power of a device that can fit in the palms of our hands. Nowadays, for many people, calculator is an application that open on their smart phones. But before it got that luxurious, ...
Ellen Chambers - 11/09/2018