Lecture05

Single particle pe each particle in solid or liquid

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: cle PE” Each particle in solid or liquid oscillates in 3-D about this equilibrium position Differences between solids and liquids? M. Chertok, Physics 7A 10 DLM09 3.1.4 Follow up of DLM08 FNTs: Relate particle spacing to “non-interaction” of ideal gas molecules. Use PE graph Two atoms and r=1.2σ. What is total energy if: a) atoms at rest, or, b) atoms have total KE 0.1ε Use total energy plus fact that KE≥0 to plot KE for atom-atom potential Plot Etot and KE for various Etot M. Chertok, Physics 7A 11 Kinetic Energy Pair-wise or Atom-Atom Potential (as modeled with the Lennard-Jones Potential) 1 0.8 Potential Energy (in units of well depth, ") Pair-wise Potential (as modeled with the Lennard-Jones Potential) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -1.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 Etot = -0.25ε distance between centers of atoms, r (in units of particle diameter, ! ) How do we determine KE? 1. Plot PE 2. Draw horz. line for Etot 3. KE = Etot - PE 4. “Turning points” at KE=0 tion for noble gas atoms. However, all pair-wise s) have this general shape with these features. rmin and rmax?) (Finish on board. What are M. Chertok, Physics 7A 12 DLM09 3.1.4 Follow up of DLM08 FNTs: (continued) How do bound particles behave? Unbound? Numerical: how much energy need to break bond? Connect macroscopic and microscopic energy systems boiling water example M. Chertok, Physics 7A 13 DLM09, (ii) 3.1.5...
View Full Document

Ask a homework question - tutors are online