If the tunneling current is to be decreased by a factor of 3, determine how much farther away must the tip be moved from the sample? In a scanning tunneling microscopy experiment, suppose that the wave function of the electron tunneling among the sample and tip is Ψ =Be-κ x where κ = {2me(V - E) / (h-bar2 }1/2 and(V-E)=2.5 eV.