1127_Physics ProblemsTechnical Physics

1127_Physics ProblemsTechnical Physics - 468 Introduction...

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468 Introduction to Quantum Physics P40.14 Km v max max .. . . == 1 ×× = × = −− 1 22 9 11 10 4 60 10 9 64 10 0 602 23 1 5 2 20 ej e j J e V (a) φ =− = −= EK max 1240 0602 138 eV nm 625 nm nm eV (b) f h c ×⋅ × F H G I K J 1 38 1 60 10 334 10 34 19 14 . eV 6.626 10 J s J 1 eV Hz P40.15 (a) λ c hc = Li: c = ×⋅× × = 6626 10 300 10 2 30 1 60 10 540 34 8 19 Js ms eV J eV nm e j af Be: c = × = 3 90 1 60 10 318 34 8 19 eV J eV nm e j Hg: c = × = 4 50 1 60 10 276 34 8 19 eV J eV nm e j λλ < c for photo current. Thus, only lithium will exhibit the photoelectric effect. (b) For lithium, hc K =+ max 400 10 2 30 1 60 10 129 10 0808 34 8 9 19 19 max max × + = m eV e V e j a f K K P40.16 From condition (i), hf e V S 11 bg and hf e V S ∆∆ VV SS 12 148 . V . Then φφ 21 e V . From condition (ii), hf hf cc 2 2 0600
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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