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**Quantum Physics in Radiation Density: Understanding Energy Carried by Photons**

Explore Rayleigh-Jeans Law's limitations for low frequencies, Planck's law, Einstein coefficients, absorption and concentration effects, molar extinction, and the Laser equation.

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**Quantum Physics in Radiation Density: Understanding Energy Carried by Photons**

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  1. energy density Rayleigh-Jeans Law: predicts the radiation density correctly only for low frequencies Planck’s law: energy carried by one photon:

  2. Relationship between Einstein coefficients:

  3. absorption cross section absorbance concentration molar extinction coefficient

  4. Laser equation: gain losses

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