Interpreting formulas and graphs

When you pose a question to students about a non-trivial concept, and they get it wrong, it’s not obvious where the error occurred, which step they missed or misunderstood.

Every now and then, though, you find a “diagnostic” question that clearly discriminates between the people who have a certain morsel of knowledge and those who don’t. I found one of these questions in the #astro101 class I’m working on.

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