Answer:
Laser beams
Explanation:
The laser beams technology is being used by bar code reader.
The answer is Software. It consists of detailed, preprogrammed instructions that control and coordinate the computer hardware components in an information system. It is a set of instructions and related documentation that tells a computer what to do or how to perform a task or it can mean all the software on a computer, including the applications and the operating system.
Answer:
Physical science is the study of the inorganic world. That is, it does not study living things. (Those are studied in biological, or life, science.) The four main branches of physical science are astronomy, physics, chemistry, and the Earth sciences, which include meteorology and geology.
A device, usually external to a computer that is plugged into a computer's communication port or is connected wirelessly. Common peripherals are keyboards, mice, monitors, speakers, and printers
