Process of Respiration

Electromagnetic waves carry communications long distances through space at a very fast speed.

Cellphones send and receive microwaves to communicate with an antenna at a base station. Base stations provide service to a limited area, and it takes many base station(s) to provide coverage to a city. Information is sent between base stations using fiber-optic cables

A fiber-optic cable uses infrared light to transmit signals to a router, which converts the signals into EM waves that transmit information to client devices, such as cellphones and computers.

Scanners collect information and examine objects. Computer scanners copies images and texts using reflected visible light waves. Bar code scanners read black and white patterns using red light. Baggage security scanners make images using transmitted and absorbed x-rays. An X-ray machine sends X-rays through a patient's body. Denser parts of the body, such as bones, absorb more X-rays and show up as a lighter color on the X-ray image.

Moving towards the observer, the waves seem to have higher frequency. Moving away from the observer, the waves seem to have lower frequency.

A semiconductor absorbs photons in sunlight. Then electrons are freed and flow through the device. Finally, electrons produce electricity as they flow through metal contacts.