Discussion
Arrange these separations in order of the property they exploit, from size to appearance:
1. Indented cylinder separating on length
2. Screen separating on width
3. Gravity table separating on density
4. Colour sorter separating on reflected light
Select the correct sequence.
Answer: A
Correct answer: 2, 1, 3, 4
The order runs from the simplest geometric property to the most abstract. A screen separates on width (2), the most direct size measure. An indented cylinder separates on length (1), still a dimension but one no screen can address.
A gravity table separates on density (3), a bulk physical property rather than a dimension at all. A colour sorter separates on reflected light (4), a surface appearance carrying no information about size or mass. Each step addresses material the previous stage cannot distinguish.
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