()()2122111110481exp 220.70nm1exp8 938MeV 6.0eV 5.0eV6.25 10s1240eV nm3.37 10s10y,pbmU EtnTLnh−⎛⎞π−⎜⎟==⎝⎠π=−×⋅=×≈which is much longer than the age of the universe. (b) Replacing the mass of the proton with that of the electron, we obtain the corresponding waiting time for an electron: ()12211981exp 2.70nm1exp8 0.511MeV 6.0eV 5.0eV6.25 10s1240eV nm2.1 10s.ebTL2−−⎡⎤⎢⎥⎣⎦πThe enormous difference between the two waiting times is the result of the difference
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