Which of the following statements best describes what is "relative" in the theory of relativity?
A)The theory says that everything is relative.
B)The theory says that the speed of light is relative,and depends on who is measuring it.
C)The theory says that truth can never be established in any absolute sense.
D)The theory says that measurements of motion make sense only when we state what they are measured relative to.

Question

Quizplus · Accepted Answer

In the theory of relativity, the concept of motion can only be understood in terms of the frames of reference used to make measurements. In other words, a measurement of motion only makes sense when we state what it is measured relative to. Therefore, D is the best answer. A is too broad, as the theory of relativity applies specifically to measurements of motion. B is incorrect, as the theory of relativity states that the speed of light is always constant, regardless of who is measuring it. C is also incorrect, as the theory of relativity provides a framework for establishing truth through measurements made in different frames of reference.

Which of the Following Statements Best Describes What Is "Relative