Which type of scanner uses X-rays, and why?
A. Computer scanners, because X-rays release electrons via the
photoelectric effect
B. Bar-code scanners, because X-rays produce a pattern of reflected
light when they shine on a pattern of black-and-white images
C. Security baggage scanners, because X-rays either pass through or
are absorbed by the objects in the baggage, creating an image of
the objects
D. Bar-code scanners, because X-rays are low-energy waves, making
it safe for the machine operators
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