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      Show that the probability that electron in the ground state of hydrogen
       atom will be found outside the classical region is $26e^{-4}$.  It is
       given that the wave function of the electron,  in the ground state, is
         $$ \psi({\bf r}) = 2 \left(1\over a_0\right)^{3/2} \exp(-r/a_0) $$

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