7.15 and 7.16 Plenary Answers 12 January 2012 10:24
1. How are alpha particles deflected by the "Plum Pudding Model" [cid:image001.jpg@01CD01E5.DFD5ED10] The alpha particles are not deflected - they pass straight through
2. How are alpha particles deflected by "Rutherford's Nuclear Model" [cid:image002.jpg@01CD01E5.DFD5ED10]
· Most alpha particles are undeflected and pass straight through
· Some alpha particles are deflected through a small angle
· A few alpha particles are deflected through a large angle
· What happens if you increase the speed of the alpha particles? [cid:image003.jpg@01CD01E5.DFD5ED10] The amount of deflection decreases as the alpha particles have more Kinetic Energy to overcome a greater amount of Electrostatic Potential Energy of their repulsion with the nucleus.
4. What happens if you increase the charge of the nucleus? [cid:image004.jpg@01CD01E5.DFD5ED10] The amount of deflection increases as there is now greater electrostatic repulsion between the nucleus and the alpha particle
5. What happens if you increase the number of neutrons in the nucleus? [cid:image005.jpg@01CD01E5.DFD5ED10] The amount of deflection is unaffected (increasing the number of neutrons does not affect the charge on the nucleus)
1. How are alpha particles deflected by the "Plum Pudding Model" [cid:image001.jpg@01CD01E5.DFD5ED10] The alpha particles are not deflected - they pass straight through
2. How are alpha particles deflected by "Rutherford's Nuclear Model" [cid:image002.jpg@01CD01E5.DFD5ED10]
· Most alpha particles are undeflected and pass straight through
· Some alpha particles are deflected through a small angle
· A few alpha particles are deflected through a large angle
· What happens if you increase the speed of the alpha particles? [cid:image003.jpg@01CD01E5.DFD5ED10] The amount of deflection decreases as the alpha particles have more Kinetic Energy to overcome a greater amount of Electrostatic Potential Energy of their repulsion with the nucleus.
4. What happens if you increase the charge of the nucleus? [cid:image004.jpg@01CD01E5.DFD5ED10] The amount of deflection increases as there is now greater electrostatic repulsion between the nucleus and the alpha particle
5. What happens if you increase the number of neutrons in the nucleus? [cid:image005.jpg@01CD01E5.DFD5ED10] The amount of deflection is unaffected (increasing the number of neutrons does not affect the charge on the nucleus)
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