Spectroscopy

Recap on related topics:

-    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.

Overview:

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