How are electromagnetic waves used in a bar-code scanner?
O A. An image is produced when a silicon chip releases electrons by the photoelectric effect. OB. Red light shines on a bar code, and light is reflected according to the black-and-white pattern.
C. Visible light is reflected off an object and then captured by a charge-coupled device.
O D. X-rays shine on objects, and the rays either pass through or are absorbed by the objects.

Question

jessicatatro23 jessicatatro23

09-06-2022
Physics

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How are electromagnetic waves used in a bar-code scanner?
O A. An image is produced when a silicon chip releases electrons by the photoelectric effect. OB. Red light shines on a bar code, and light is reflected according to the black-and-white pattern.
C. Visible light is reflected off an object and then captured by a charge-coupled device.
O D. X-rays shine on objects, and the rays either pass through or are absorbed by the objects.

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sp10925 sp10925 · Answer 1 · 2022-06-16T13:16:57+02:00

The electromagnetic waves used in a bar-code scanner by an image is produced when a silicon chip releases electrons by the photoelectric effect and Visible light is reflected off an object and then captured by a charge-coupled device.

What is electromagnetic wave?

The electromagnetic wave is the white light or Sunlight coming directly from the Sun. This light ray is the form of wave. This light when falls on any object segregates into the range of all types of EM radiation.

Radiation is packet of energy that travels and spreads out. It has radio waves, infrared waves and visible light waves, ultraviolet rays and microwaves.

Bar code scanner uses the photoelectric effect and visible light reflection phenomenon.

Thus, the correct options are A and C.

Learn more about electromagnetic wave.

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