COMPUTER ARCHITECTURE
INPUTOUTPUT DEVICES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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it is used solely by the supermarket
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it is used to scan the type of good
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it uses an led and photosensitive cells to detect the bar lines
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None of the above
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Detailed explanation-1: -A barcode reader works by directing a beam of light across the barcode and measuring the amount and pattern of the light that is reflected. The scanner converts the light energy into electrical energy, which is then converted into data by the decoder and forwarded to a computer.
Detailed explanation-2: -Almost all of them use a laser. Unlike the simpler single-line laser scanners, they produce a pattern of beams in varying orientations allowing them to read barcodes presented to it at different angles.
Detailed explanation-3: -Laser barcode scanners use a visible and repetitive “flashing” laser light beam, commonly used to track inventory and to enter purchases into a computerized management system. The scanner is a wonderful tool for providing fast and easy customer service in places like supermarkets and restaurants.