Wednesday 7 March 2012

7.15 and 7.16

7.15 and 7.16 starter

12 January 2012

10:36
· What is the charge on an alpha particle?
· What is the charge on the nucleus of a gold atom, 19779Au?
· If an alpha particle came close to the nucleus of a gold atom, what would happen?

Answers
· Alpha particle, charge = +2
· Nucleus of gold atom, charge = +79
· The positive charge on the alpha particle will repel with the positive charge on the gold nucleus and the alpha particle would be deflected. Have a look at the animation to see this happening

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7.15 and 7.16

12 January 2012

10:24
· 7.15 describe the results of Geiger and Marsden’s experiments with gold foil and alpha particles
· 7.16 describe Rutherford’s nuclear model of the atom and how it accounts for the results of Geiger and Marsden’s experiment and understand the factors (charge and speed) which affect the deflection of alpha particles by a nucleus

Alpha particle scattering experiment and the nuclear atom - taken from BBC "The Atom"

Rutherford's Experiment: Nuclear Atom


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DJFPh105rutherford.swf Download this file

alpha particle scattering.pptx Download this file

alpha particle scattering - atomic structure evidence.swf Download this file

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