The Schrodinger wave equation for hydrogen atom is ψ2s=142π1a03/2 2-ra0 e-r/a0 where a0 is Bohr's radius. If the radial node in 2s be at r0, then r0 would be equal to:

1.  a02

2.  2a0

3.  2a0

4.  a02

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