Difficult
The wave function $R_{2,0}$ for hydrogen atom is $R_{2,0} = K(2 - r/a_0) \exp(-r/2a_0)$,where $K$ is a constant. The distance $r$ at which $R_{2,0}$ exhibits a nodal point is at:
- A$a_0$
- B$2a_0$
- C$3a_0$
- D$4a_0$
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