p39_082 - 82(a The rate at which incident protons arrive at...

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82. (a) The rate at which incident protons arrive at the barrier is n =1 . 0kA / 1 . 60 × 10 19 C=6 . 25 × 10 23 / s. Letting nTt = 1, we fnd the waiting time t : t =( nT ) 1 = 1 n exp à 2 L r 8 π 2 m p ( U E ) h 2 ! = µ 1 6 . 25 × 10 23 / s exp µ 2 π (0 . 70 nm) 1240 eV · nm p 8(938 MeV)(6 . 0eV 5 . 0eV) =3 . 37 × 10 111 s 10 104 y , 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:
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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