Which of the SI Standard Units Is NOT Based on a Constant

question 9

Multiple Choice

Which of the SI standard units is NOT based on a constant of nature?

• A)The meter, because the speed of light can vary from place to place.
• B)The second, because cesium cannot be found everywhere.
• C)The kilogram, because it is based on an arbitrary piece of metal.
• D)The kilogram, because the gram is the standard unit.
• E)The meter, because it is defined in terms of the speed of light in vacuum, and there is no perfect vacuum anywhere.

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