The graph between and r ( radial distance ) is shown below.
This represents :
For 's' , graph always starts from above.
For every other orbital, graph starts from origin.
this graph is for 's'-orbital.
=> Thus , l=0
=> In this graph, only one radial node is present ( point A).
We know that, radial node is given by (n-l-1)
n-l-1 = 1( as only one radial node is present)
n-1 = 1 ( l = 0)
=> n = 2
graph is for 2s
So, option (2) is correct.
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