Physics
NULL
Medium
Question
Which of the following is not a correct representation method for prefixes______________?
A
1mm
B
10 km
C
1000um
✓ Official correct answer
D
Both A and B
Community credibility
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A
1mm
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B
10 km
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C
1000um
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D
Both A and B
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Explanation
By SI convention, a quantity's prefix should be chosen so the numeric value stays between about 0.1 and 1000. "1000 um" (1000 micrometers) violates this convention, since it is better and more standardly expressed as "1 mm".
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