Properties of waves
The boat scenario
Sound wave animation
Question 1: The trumpet
Electromagnetic waves
Electromagnetic wave applet
Wavelength
Question 2: Redshift?
The 3 causes
Cosmic background radiation
Hot dense initial state
Intensity v. Wavelength
As the universe expands wavelength increases
Question 3: After the universe became transparent
Electromagnetic radiation
Question 3 continued
Before and after
Detecting CBR photons
