The graph between |Ψ|² and r (radial distance) is shown below. This represents: 2s orbital, 3s orbital, 1s orbital, 2p orbital

Solution: - (D) 2s orbital
Graph of |Ψ²| vs r, touches r axis at 1 point so it has one radial node and since at r=0, it has some value so it should be for 's' orbital.
∴ n - l - 1 = 1
where l = 0 ⇒ n - 1 = 1
∴ n = 2 ⇒ 2s orbital