- The theory of star formation is a model developed by observing different stars and realising that each is at a different stage.
- In outer ‘space’ there’s roughly 1 atom present per cm3
- Dense gas Clouds take place between stars and consists of plasma, nuclei, electrons, ions and dust of other stars that combusted due to Super Novas.
- In Dense gas clouds, particles have low kinetic energy, which promotes gravitational forces to hold the molecules together. This eventually results in parts of the clouds compressing.
- Nuclear fusion is a nuclear reaction – it is when nuclei join.
Spectroscopy is the study of light and matter.
We use two models to describe light.
1- The Particle Model
This was deviced by Alvert Einstein. He suggested that light is a stream of photon packages, and that the energy of the photons is relative to the position of the light in the electromagnetic spectrum.
Max Planck suggested that E = h v
Where E is the energy of a photon.
V is the frequency of the light.
h is the “Planck constant” which is equal to 6.63 x 10-34
2- The Wave Model
The wave model centres around the idea that light, as a part of the electromagnetic spectrum has a wave with specific characteristics (Wave length and frequency).
n.b. Speed of light (Symbol c) is equal to 3.00 x 108 ms-1
Wave length is symbol λ
Freqncy is symbol v
c = λ v