Exam-style question
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How can the slope of a velocity-distance graph be interpreted in the context of Hubble's law?.
Model answer
What a good answer should say
- The slope of the velocity-distance graph represents Hubble's constant, which quantifies the rate of expansion of the universe.
- A steeper slope indicates a faster expansion rate.
Explanation
Why this works
The evidence is the slope of the graph, which shows the relationship between velocity and distance. This implies that Hubble's law can be used to calculate the expansion rate of the universe, leading to the conclusion that the universe is expanding at a measurable rate.
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