emptymalei / physics-backup

Decapricated!! Moved to https://github.com/emptymalei/physics | This is a fork of my previous notes from CosmologyTaskForce. Now this one is also decapricated.

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Quantities

  1. Fine structure constant: $$\alpha = \frac{k_e e^2}{\hbar c} \propto e^2$$.
  2. Bohr radius: $$a_0 = \frac{\hbar}{m_e c \alpha} $$.
  3. Parallel capacitors:
    1.

Important Processes

  1. Compton scattering:
    1. The change in the wavelength of the electron is related to the de Broglie wavelength of the electron, $\lambda_e = \frac{h}{m_e c}$.
    2. Zero scattering angle means no change in wavelength, since no recoil happens.
    3. Bouncing back gives the max change in wavelength of photons.
    4. The relation is $\lambda'-\lambda = \lambda_e (1 - \cos \theta)$, where $\theta$ is the scattering angle between photon incoming momentum and the outgoing momentum.

Some Concepts

  1. Semiconductors
    1. n-type: more electrons
    2. p-type: more hole concentrations