1) 4 Exercises in your textbooks
Show all work; remember to attempt all sums (an honest attempt - spend time, think about it, write down useful equations, search on the internet for help)
- p. 232 (5-8) in the HL book
- p. 149(1-4) in SL book
2) Watch the simulations of the "Rutherford Atom" and the "Plum Pudding Atom" and answer the questions given below
On the top front of the page it says "Rutherford Scattering" and you can either download it or "run now." A page will come up which has two tabs at the top left. The first tab is the "Rutherford Atom" and the second is the "Plum Pudding Atom"
Make sure you have Java installed (download it for free if you don't have it).
Using the Simulations:
For both simulations, there is a container-looking thing on the left side of the screen which says "0". Press the button to start the simulation and "1" will appear on the container. There are many different features on the right panel - energy level, show traces etc. Play around with them and watch how the experiment changes
Questions:
Answer the following questions based on the simulations (refer to the HL textbook and/or "Quantum Theory Cannot Hurt You" to help you answer the questions)
Plum Pudding Atom
1) What does the large red globby mass represent?
2) Suppose that there are 109 blue dots representing electrons. What would be the total charge of the red mass?
3) Look closely at the alpha particles being shot through the atom. Based on the legend at the right, what are alpha particles made of?
4) Compare the trajectories of the alpha particles when their energy is minimum and when it is maximum.
Rutherford Atom
5) When the simulation opens (before any settings are changed), of which element is the atom shown?
6) Press "show traces". Write a few sentences describing what is taking place in the "experiment." Write your observations as though you're a scientist taking careful notes to describe the phenomenon you see. Mention the role of protons, neutrons in your notes.
7) Do electrons play a role in this experiment?
8) Now set the "Energy" to minimum. What change do you observe in the trajectory of the alpha particles as compared to the original energy setting?
9) Give a hypothesis as to why all alpha particles turn and return to the
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