Question

what are two things that happen when a home computer scanner uses electromagnetic waves? a. red light shines on patterns of black and white, recording the pattern of reflected light. b. a charge - coupled device captures visible light that is reflected off an object. c. objects are exposed to x - rays, which either pass through or are absorbed by the objects. d. a silicon chip releases electrons by the photoelectric effect, producing an image.

Explanation:

Home - computer scanners use visible light. They shine light on an object and a charge - coupled device (CCD) captures the reflected visible light. Also, light (a form of electromagnetic wave) can be used to record patterns of black and white by shining on them and recording the reflected light. X - rays are not used in home computer scanners, and while the photoelectric effect is a real phenomenon, it's not the main process in home computer scanners.

Answer:

A. Red light shines on patterns of black and white, recording the pattern of reflected light.
B. A charge - coupled device captures visible light that is reflected off an object.