59. A light of wavelength 400 nm falls on a metal surface having a work function 1.70 eV. What isthe maximum kinetic energy of the photoelectrons emitted from the metal?
( c = 3.00 × 108 m/s, h = 6.626 × 10-34 J●s , 1 eV = 1.60 × 10-19 J)
(A) 4.52 eV
(B) 3.11 eV
(C) 2.82 eV
(D) 1.70 eV
(E) 1.41 eV
【用戶】面試倒楣鬼-22幸運上後西
【年級】大一下
【評論內容】一定要背的實用速算數字hC= 1240nm*eVhC/λ= eV 或 hC/eV= λ1240/400=3.1eV所求=3.1-1.7 ~=1.4eV (E)
【用戶】面試倒楣鬼-22幸運上後西
【年級】大一下
【評論內容】一定要背的實用速算數字hC= 1240nm*eVhC/λ= eV 或 hC/eV= λ1240/400=3.1eV所求=3.1-1.7 ~=1.4eV (E)