The Figure Below Shows a Graph of the Scale Factor

question 17

Multiple Choice

The figure below shows a graph of the scale factor, R_U, with time, for three different scenarios.The age of the universe is the difference between now and the time at which R_U is zero. Which curve illustrates an accelerating universe?

• A) A
• B) B
• C) C
• D) All of these curves are valid for an accelerating universe.
• E) None of these curves is valid for an accelerating universe.

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