Thermodynamics and Statistical Mechanics
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Transcript of Thermodynamics and Statistical Mechanics
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Thermodynamics and Statistical MechanicsBlackbody Radiation
Thermo & Stat Mech - Spring 2006 Class 21
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Classical Energy Equipartition
Thermo & Stat Mech - Spring 2006 Class 21
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Classical Energy Equipartition
Thermo & Stat Mech - Spring 2006 Class 21
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Classical Energy Equipartition
Thermo & Stat Mech - Spring 2006 Class 21
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Quantum Harmonic Oscillator
Thermo & Stat Mech - Spring 2006 Class 21
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Energy of EM Waves in a CavityCalculate the number of standing wave states in the frequency range between w and w + dw. Then Bose-Einstein statistics is used to determine the number of photons in each state. With that information the energy can be calculated.
Thermo & Stat Mech - Spring 2006 Class 21
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Density of States (Lec 17)
Thermo & Stat Mech - Spring 2006 Class 21
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Density of States for Photons
Thermo & Stat Mech - Spring 2006 Class 21
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Photon Energy
Thermo & Stat Mech - Spring 2006 Class 21
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Photon Energy
Thermo & Stat Mech - Spring 2006 Class 21
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Graph
Thermo & Stat Mech - Spring 2006 Class 21
Chart1
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5000
6000
7000
Photon Energy (eV)
Energy Density
Black Body Radiation
Sheet1
Black Body Radiation
k =8.63E-05eV/K1.31E+19
h =4.14E-15eV-s
c =3.00E+08m/s
2.00E-02eV
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Sheet1
5000
6000
7000
Photon Energy (eV)
Energy Density
Black Body Radiation
Sheet2
Sheet3
-
Total Energy Density
Thermo & Stat Mech - Spring 2006 Class 21
-
Energy Flux
Thermo & Stat Mech - Spring 2006 Class 21
-
Human Eye and the SunIt is often stated in textbooks that the peak sensitivity of the human eye is at the wavelength at which the energy radiated by the sun is maximum.
Thermo & Stat Mech - Spring 2006 Class 21
-
Human EyePeak at 555 nm
Thermo & Stat Mech - Spring 2006 Class 21
-
A Problem?The graph of the energy density as a function of frequency, for a blackbody at a temperature of 5800 K, has a maximum at 1.41 eV. Photons of that energy have a wavelength of 879 nm, which is out of the visible spectrum, in the infrared. What is wrong?
Thermo & Stat Mech - Spring 2006 Class 21
-
SolutionThe energy density is plotted as a function of energy, while the eyes sensitivity is plotted as a function of wavelength. If we plot the energy density as a function of wavelength, its peak does not occur at 879 nm. How can this be?
Thermo & Stat Mech - Spring 2006 Class 21
-
Change to Wavelength
Thermo & Stat Mech - Spring 2006 Class 21
-
Wavelength Spectrum
Thermo & Stat Mech - Spring 2006 Class 21
-
Graph
Thermo & Stat Mech - Spring 2006 Class 21
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5000
5800
7000
Wavelength (m)
Energy Density
Black Body Radiation
Sheet1
Black Body Radiation
k =8.63E-05eV/K1.31E+19
h =4.14E-15eV-s
c =3.00E+08m/s
1.00E-02eV1.41E+00
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Sheet1
5000
5800
7000
Photon Energy (eV)
Energy Density
Black Body Radiation
Sheet2
Black Body Radiation
k =1.38E-23J/K5.00E-24
h =6.63E-34J-s
c =3.00E+08m/s
5.00E-09m5.00E-07
500058007000
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Sheet2
5000
5800
7000
Wavelength (m)
Energy Density
Black Body Radiation
Sheet3
-
AgreementThe maximum of the graph for 5800 K, the temperature of the suns surface has a maximum at 500 nm, in reasonable agreement with the peak sensitivity of the human eye.
Thermo & Stat Mech - Spring 2006 Class 21
-
Wien Displacement Law
Thermo & Stat Mech - Spring 2006 Class 21
-
Photon Gas
Thermo & Stat Mech - Spring 2006 Class 21
-
Helmholtz Function
Thermo & Stat Mech - Spring 2006 Class 21
-
Pressure
Thermo & Stat Mech - Spring 2006 Class 21
4/07/06