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.

---

Definitions:

Planning Strategies

Approaches and methods used in preparing for future action, especially in business, government policy, and personal objectives.

Pros And Cons

The advantages (pros) and disadvantages (cons) of a particular decision, situation, or system, considered when making a choice.

Consistent

Showing steady conformity to a particular pattern, standard, or set of rules over time.

Over Time

A period extending beyond the usual hours of work, often associated with additional pay; or gradually through a period.