Difference between revisions of "3-RAD-01"
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* Students should recall that like charges repel. | * Students should recall that like charges repel. | ||
* Using the observations from the Geiger and Marsden’s experiment they should be able to make conclusions about the structure of the atom and how they support the Rutherford model. | * Using the observations from the Geiger and Marsden’s experiment they should be able to make conclusions about the structure of the atom and how they support the Rutherford model. | ||
| + | * To understand the factors (charge and speed) which affect the deflection of alpha particles by a nucleus. | ||
==[[Specifications|Specification]] References== | ==[[Specifications|Specification]] References== | ||
| Line 12: | Line 13: | ||
==Main Body of Lesson== | ==Main Body of Lesson== | ||
| − | * Help | + | * Help students recall that like charges repel and unlike charges attract. |
* Teacher must state that the alpha particles are positively charged. | * Teacher must state that the alpha particles are positively charged. | ||
| + | * Introduce the [[plum pudding model]] | ||
| + | * Introduce the [[Alpha scattering experiment]], discuss the experimental set-up (the vacuum, alpha source, lead casing, phophorus screen etc..) and predict what would happen when alpha particles are fired at atoms based on the plum pudding model. | ||
* Use the 'Plum pudding model box' and the 'Rutherford model box' to simulate the experiment. Start with the ‘dilute positive sphere' in the 'Plum pudding model box', explaining that this is what they expected to see and then move onto the 'Rutherford model box'. These should be done undercover, the boxes should not be lifted. Students should only observe the results. | * Use the 'Plum pudding model box' and the 'Rutherford model box' to simulate the experiment. Start with the ‘dilute positive sphere' in the 'Plum pudding model box', explaining that this is what they expected to see and then move onto the 'Rutherford model box'. These should be done undercover, the boxes should not be lifted. Students should only observe the results. | ||
* Emphasise the observations as a class and then split them into groups and using the [[observations and conclusions sheet]] they could try to draw a conclusion on the structure of the atom. | * Emphasise the observations as a class and then split them into groups and using the [[observations and conclusions sheet]] they could try to draw a conclusion on the structure of the atom. | ||
| Line 21: | Line 24: | ||
==Homework== | ==Homework== | ||
| − | * Write a dialogue between two people explaining the plum pudding and Rutherford models, the | + | * Write a dialogue between two people explaining the plum pudding and Rutherford models, the alpha scattering experiment and how their observations led to the Rutherford model of the atom. |
=Additional Information= | =Additional Information= | ||
===Resources Required=== | ===Resources Required=== | ||
| − | * Dialogue sheet on | + | * Dialogue sheet on Radioactivity |
| + | * Plum pudding sheet | ||
| + | * Alpha scattering experiment sheet | ||
* One Ramp | * One Ramp | ||
* Set of metal balls | * Set of metal balls | ||
| Line 45: | Line 50: | ||
===Notes=== | ===Notes=== | ||
* ''None'' | * ''None'' | ||
| − | [[Category: | + | [[Category:Radioactivity]] |
| − | + | ||
[[Category:Observation]] | [[Category:Observation]] | ||
| − | |||
Latest revision as of 15:58, 14 May 2008
Contents
Outcomes
- Student should be able to describe and compare the Plum Pudding model and the Rutherford model of the atom.
- Students should recall that like charges repel.
- Using the observations from the Geiger and Marsden’s experiment they should be able to make conclusions about the structure of the atom and how they support the Rutherford model.
- To understand the factors (charge and speed) which affect the deflection of alpha particles by a nucleus.
Specification References
- 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.
Starter
- Have students read outloud, and in turn, the dialogue on Radioactivity
Main Body of Lesson
- Help students recall that like charges repel and unlike charges attract.
- Teacher must state that the alpha particles are positively charged.
- Introduce the plum pudding model
- Introduce the Alpha scattering experiment, discuss the experimental set-up (the vacuum, alpha source, lead casing, phophorus screen etc..) and predict what would happen when alpha particles are fired at atoms based on the plum pudding model.
- Use the 'Plum pudding model box' and the 'Rutherford model box' to simulate the experiment. Start with the ‘dilute positive sphere' in the 'Plum pudding model box', explaining that this is what they expected to see and then move onto the 'Rutherford model box'. These should be done undercover, the boxes should not be lifted. Students should only observe the results.
- Emphasise the observations as a class and then split them into groups and using the observations and conclusions sheet they could try to draw a conclusion on the structure of the atom.
Plenary
- Remove the box and review the conclusions made
Homework
- Write a dialogue between two people explaining the plum pudding and Rutherford models, the alpha scattering experiment and how their observations led to the Rutherford model of the atom.
Additional Information
Resources Required
- Dialogue sheet on Radioactivity
- Plum pudding sheet
- Alpha scattering experiment sheet
- One Ramp
- Set of metal balls
- One Rutherford model and one ‘dilute positive charge’ drawn on a piece of paper with two boxes to go over top. Boxes must have slits along base to allow ball to travel through.
- Observations and conclusions sheet
Textbook References
- Physics for You p.g. 94-95
Website References
- none
Skills Addressed
Safety/Hazards
- none
Notes
- None
