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Intro to Early Quantum Theory

Discover the electron through cathode rays, oil-drop experiments, blackbody radiation, and Wien’s law. Learn about Planck’s quantum hypothesis and energy quantization. Estimate the Sun’s surface temperature and understand star colors.

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Intro to Early Quantum Theory

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  1. Early Quantum Theory and Models of the Atom

  2. Discovery of Electron

  3. Cathode Rays

  4. e/m measurement

  5. Oil-Drop Experiment to find e

  6. Blackbody Radiation

  7. All objects emit radiation whose total intensity is proportional to the fourth power of the Kelvin temperature.

  8. A blackbody is a body that would absorb all the radiation falling on it.

  9. Wien’s Law

  10. The Sun’s Surface Temperature Estimate the temperature of the surface of our Sun, given that the Sun emits light whose peak is in the visible spectrum at around 500 nm.

  11. Star Color Suppose a star has a surface temperature of 32,500 K. What color would this star appear?

  12. Energy distributed among the oscillating electric charges of the molecules is not continuous, but instead consists of a finite number of very small discrete amount, each related to the frequency of oscillation as:

  13. Planck’s Quantum Hypothesis Planck’s assumption suggests that the energy of any molecular vibration could be only some whole number multiple of hf:

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