Which of the following is not a correct representation method for prefixes______________?
Correct answer: C. 1000um
- A. 1mm
- B. 10km
- C. 1000um
- D. Both A and B
Explanation
The prefix micro means 10^-6 and its proper SI symbol is μ, so the standard representation is 1000 μm, not 1000 um. The other forms, 1 mm and 10 km, use valid milli and kilo prefixes. Students may choose d because they may think 1 mm is invalid, but a number may be written directly before its unit symbol.
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About Displacement and Velocity
Displacement is the directed change in position, while velocity is the rate of change of displacement and includes both magnitude and direction. The topic connects position-time and velocity-time graphs with average and instantaneous values, and distinguishes displacement from distance and velocity from speed.
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