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For 's' , graph always starts from above.
For every other orbital, graph starts from origin.
=> 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-1 = 1 (
l = 0)
=> n = 2
So, option (2) is correct.
Option 1)
3s orbital
Option 2)2s orbital
Option 3)1s orbital
Option 4)2p orbital