Niels Bohr
An expert is a person who has made all the mistakes that can be made in a very narrow field.
If anybody says he can think about quantum theory without getting giddy it merely shows that he hasn’t understood the first thing about it!

Richard Feynman
It is safe to say that nobody understands quantum mechanics.





How Small Is An Atom? Spoiler: Very Small Kurzgesagt – In a Nutshell Published on 20 Jan 2015

Aim: To define the relationship between the impact parameter b and the scattering angle theta.
Task: Plot a graph using your data collected from simulation and draw conclusion showing the relationship below.
The relation between the impact parameter and the scattering angle simplifies with the use of the distance of the closest approach parameter.
Rutherford scattering eq.jpg
Rutherford scattering trajectories of alpha particles.jpg
Rutherford scattering trajectories depend on the impack parameter.jpg
Quarks Proton and neutron structure Fundamental forces Fermi theory of beta decay Some nuclcear units from hyperphysics

Fusion: How to Put the Sun in a Magnetic Bottle - with Ian Chapman
The Royal Institution Published on 8 Jun 2016



Breakthrough in Nuclear Fusion? - Prof. Dennis Whyte MIT Club of Northern California Published on 25 Feb 2016

Summary of atomic spectra
  • atomic electrons can only exist in certain discrete energy levels.
  • light is made up of photons.
  • when electrons lose energy they give out light.
  • when light is absorbed by an atom it gives energy to the electrons.
>>when an electron changes from a high energy level to a low one, a photon of light is emitted. The electron can only exist in discrete energy levels.

DE = hf
DE : Change in energy
h : Plank constant
f : Photon frequency

EXAMPLE 1: In an atom with electrons in two energy levels, calculate the wavelength that gives the rise to a photon when the change in energy is from the -4 eV to the - 10 eV.
SOLUTION:
DE = 6 eV = 6 x 1.6 x 10-19 = 9.6 x 10-19
f = DE/h = ( 9.6 x 10-19 ) / ( 6.63 x 10-34 ) = 1.45 x 10-15 Hz

c = f l
l = ( 3 x 10 8 ) / ( 1.45 x 10-15 ) = 207 nm [UV light]