1. The wave function of 2s orbital for hydrogen atom is A [2-(r/a_o)] exp(-r/(2a_o)). Calculate the ratio of the probability of finding the electron at r= 4a_o relative to that at r=a_o?
(A)4e^-3
(B)4e^-1 
(C)2e^-3 
(D)2e^-3/2
(E)4e^-3/2

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