Exam-style question
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In a velocity-distance graph, what does a steeper slope represent?.
- A.A slower rate of expansion
- B.A faster rate of expansion
- C.No expansion
- D.A constant velocity
Model answer
What a good answer should say
- A faster rate of expansion
Explanation
Why this works
The evidence from the slope of a velocity-distance graph indicates the rate of expansion of the universe. A steeper slope shows that for each unit of distance, the velocity increases more significantly.
This implies that the universe is expanding at a faster rate, leading to the conclusion that the expansion is accelerating.
Common mistake
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