ch38-p066 - 66. (a) The rate at which incident protons...

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() ( ) 2 1 2 21 111 104 8 1 exp 2 20 . 7 0 n m 1 exp 8 938MeV 6.0eV 5.0eV 6.25 10 s 1240eV nm 3.37 10 s 10 y, pb mU E tn T L nh ⎛⎞ 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: ( ) 1 2 21 19 8 1 exp 2 . 7 0 n m 1 exp 8 0.511MeV 6.0eV 5.0eV 6.25 10 s 1240eV nm 2.1 10 s. eb T L 2 ⎡⎤ ⎢⎥ ⎣⎦ π The enormous difference between the two waiting times is the result of the difference
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