# Lecture 1503, clicker question

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The question is: An n=1 wave function is the lowest wave function that fits smoothly around the orbit. What is the quantum number of this state in a hydrogen atom?

I don't completely understand this question, and how to approach it and solve it. Could you please guide me through your thought process.

For n=1, there will be two "loops" and two nodes. Because the distance between two adjacent nodes is $\lambda /2$.