In this video Paul Andersen explains how the photons emitted from or absorbed by an atom or nuclei is directly related to electrons moving between energy level. Absorption and emission are a direct result of the conservation of energy....

Line spectra are unique patterns of light emitted or absorbed by atoms, resembling discrete lines. These patterns serve as the "fingerprints" of different elements, providing critical insights into atomic structure and composition....

This video answers:

- What is red s
hift?
- How did we discover
red shift?
- Why is sp
ace stretching
- Why is th
e universe expanding
- How to we know t

he universe is expanding


Exam board specific...

The video explains the concept of redshift and blueshift in the context of galaxy movement and how it relates to the shift in wavelength of light emitted by a galaxy. The video then shows how to use an equation to calculate the shift in...