The cardboard in Colleen's simulation symbolizes the areas that remain black on the X-ray. When the sand is sprinkled over the screen, the cardboard blocks the sand from settling in that area, creating an outline that represents how X-ray images display areas of different densities, with some areas appearing darker (like soft tissues) and others lighter (like bones).
Colleen replicates an X-ray machine by covering an open shoebox with a screen and positioning a square cardboard piece in the center. She uses sand to simulate X-ray radiation, sprinkling it over the screen. Upon removing the screen, she observes an outline of the square cardboard. What does the cardboard symbolize in her simulation?(1 point) Responses the person being scanned with X-rays the person being scanned with X-rays the veins that look white in an X-ray the veins that look white in an X-ray the areas that remain black on the X-ray the areas that remain black on the X-ray the bones that look white in an X-ray the bones that look white in an X-ray
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