Luke Physics: Fw: 7.15 and 7.16

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From: Matt Baker <maba@patana.ac.th>

Date: Wed, 7 Mar 2012 14:29:10 +0700

To: Andrew Koomenjoe Nyaga<anny14@patana.ac.th>; Arisara Amrapala<aram14@patana.ac.th>; Boondaree Chang<boch14@patana.ac.th>; Chrischawit Chomsoonthorn<chcm14@patana.ac.th>; Christopher Lo<chlo14@patana.ac.th>; Connor Blair Sailes<cosa14@patana.ac.th>; Frazer Allen Briggs<frbr14@patana.ac.th>; Huei-Yu Daniel Lo<hulo14@patana.ac.th>; Isabel Catriona McDonald<ismd14@patana.ac.th>; Kavin Supatravanij<kasu14@patana.ac.th>; Luke Michael Gebbie<luge14@patana.ac.th>; Lydia Anna Foley<lyfo14@patana.ac.th>; Morrakot Sae-Huang<mosa14@patana.ac.th>; Puchawin Borirackujarean<pubo14@patana.ac.th>; Qing Tang<qita14@patana.ac.th>; Sanyam Grewal<sagr14@patana.ac.th>; Sebastien Grimm<segr14@patana.ac.th>; Soo Hyun Lee<sole14@patana.ac.th>; Tatiksha Singh<tasi14@patana.ac.th>; Usa Wongsanguan<uswo14@patana.ac.th>; Yanida Areekul<yaar14@patana.ac.th>; Yi-Lin Huang<yihu14@patana.ac.th>

Subject: 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

<<alpha particle scattering - atomic structure evidence.swf>>

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
			<<Alpha particle scattering experiment and the nuclear atom.wmv>>