Lecture 12 - Physics 040B/001-S08 Chap. 17:1-7...

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May 13, 2008 Physics 40B Lecture 12 1 Physics 040B/001-S08 Chap. 17:1-7 Thermodynamics Review Standing Wave Patterns for Air Columns Pipe Open at Both Ends Displacement Anti-nodes Pressure Nodes (Atmospheric) Same as String f n = n v 2 L all n Open One End-Closed Other End f n = n v 4 L n odd Beats-Superposition of Two Waves with Different Frequencies f Beat = f 1 " f 2 " f = f v ± v L v m v S # $ % ( Doppler Effect for Sound Waves
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May 13, 2008 Physics 40B Lecture 12 2 Temperature and Thermodynamics Microscopic model: describe properties of individual molecules Macroscopic model: use thermodynamics variables (developed by von Helmhotz) Pressure P Temperature T Volume V # moles n Internal energy U Entropy S Use to define “state of system” without knowledge of details at microscopic level Equilibrium: variables don’t change with time Thermal equilibrium : two systems in contact will be at same temperature (eventually)
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May 13, 2008 Physics 40B Lecture 12 3 Zeroth Law of Thermodynamics Two systems in thermal equilibrium (same temperature) with a third system are in thermal equilibrium (same temperature) with each other A B C After some time, all systems equilibrium (same temperature) Needed zeroth law after 1st law of thermodynamics was defined Use zeroth law to measure temperature (Thermometry)
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May 13, 2008 Physics 40B Lecture 12 4 Constant Volume Gas Thermometer Assume T proportional to p , measure p Calibrate at freezing (0 o Celsius) and boiling (100 o Celsius) points of water at 1 atmosphere of pressure Extrapolate back to p = 0, T = -273.15 C --Absolute Zero! CVG Thermometer
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This note was uploaded on 06/18/2008 for the course PHYS 40c taught by Professor Allenzych during the Spring '08 term at UC Riverside.

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Lecture 12 - Physics 040B/001-S08 Chap. 17:1-7...

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