p39_022 - 22. (a) We use Eq. 39-6: Vstop = hf hc/ (1240 eV...

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22. (a) We use Eq. 39-6: V stop = hf Φ e = hc/λ Φ e = (1240 eV · nm / 400 nm) 1 . 8eV e =1 . 3V . (b) We use the formula obtained in the solution of problem 21: v = s 2( E photon Φ)
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