FNT8 - Physics 7A Exit Handout from DLM 08 DLM08 FNTs...

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Physics 7A Exit Handout from DLM 08 DLM08 FNTs 3.1-3) (CG 3.1) In the activity you just completed in DL, you found that the average spacing of atoms/molecules in a gas at STP is about 10 particle diameters (~10 σ ). You also know from chemistry that the molecules of an ideal gas do not interact. Relate these two ideas, the average distance between gas molecules at STP, and the non-interaction between molecules of an ideal gas, to the particle-particle interaction model as represented by the PE graph. 3.1-4) (CG 3.1) Now we want to analyze a physical system comprised of two particles (atoms or molecules). Look at the pair-wise potential energy graph you received in DL. Suppose r is equal to 1.2 σ . a) Suppose the particles are momentarily at rest at r = 1.2 σ (like a ball at the top of its trajectory when thrown straight up ). What can you say about the total energy, E tot , and the subsequent motion of the two particles?
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FNT8 - Physics 7A Exit Handout from DLM 08 DLM08 FNTs...

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