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pc1144_ay0607_sem2 - Answers to PC1144 AY0607 Paper Part I...

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Answers to PC1144 AY0607 Paper Part I 1(a) s 693 . 0 1(b) 205.6 m 2(a) 49.38 minutes 2(b) 8.89 × 10 11 m 3 Probability = 0.198, greater than classical as classical probability = 0.10 4(a) ) 0 ( ) 0 ( 2 1 , ) ( ) ( 3 2 L L At 0 x , ) ( ) ( 2 1 x x At L x , ) ( ) ( 3 2 x x 4(b) Reason: The Schrodinger equation gives sinuisoidal solutions to the 3 regions in concerned. 5(a) Possible particles: 0 0 0 , , 5(b) Possible particles: 0 0 , Part II 6(a)(i) Photon energy lower than work function as λ increases, photoelectrons cannot emit. Classically, electrons can emit at any wavelengths as long as electrons absorb enough energy. 6(a)(ii) KE max depends on frequency of light, increase intensity does not change f . Classically, increased intensity allows electrons to absorb more energy, so KE max should increase. 6(a)(iii) Increase λ , f decreases, photon energy increases, KE max increases. Classically, KE max should not change with decreasing λ .
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