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2026-09-14 10:43:03: Viruses 2

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john ruina
2026-09-14 10:43:04 -04:00
parent fba8eb990e
commit a9a6ad2c1a
6 changed files with 76 additions and 34 deletions
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physics/Modern Physics/Bohr Model of Atomic Structure.md
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[[Modern Physics]]
# Summary
* Atoms have a small positive nucleus made of protons and neutrons and are usually surrounded by electrons.
* Nuclear notation: $^A_ZX$, Z protons A mass X atomic symbol
* Ion is atom with net charge.
* In Bohr model, Coulomb force between nucleus and electrons provides centripetal force for circular orbit: $F_e=k\frac{q_1q_2}{r^2}$ supplies $F_{net}=m\frac{v^2}{r}$
* Circumference must equal a whole number of de Broglies wavelength: $n\lambda=2\pi r$
* Atomic structure here is only defined as energy levels, no probability functions yet.
physics/Modern Physics/Modern Physics.md
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[[physics]]
physics/Modern Physics/Quantum Theory and Wave Particle Duality.md
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[[Modern Physics]]
# Summary
* Quantum theory developed because classical physics can't explain atomic spectra, blackbody radiation or photoelectric effect.
* Photons are electrically neutral massless particles.
* $E=hf$, with $h$ being Planck's constant.
* Photons travel at $c=$ 299792458 m/s (or $c=3*10^8$ for simplification) in a free space, and are slowed by a factor of the medium's index of refraction.
* Particles like electrons show wave behavior, quantified by de Broglie wavelength $\lambda=h/p$. Wavelength increases as momentum decreases.
* Quantum effects matter when a particles de Broglie wavelength is comparable to the system.
* In bound systems, energy and momentum are discrete.