1. Doppler Effect and Redshift

2. Parts of a Wave

3. Wave Properties Wavelength
Wavelength, l, is the distance between two consecutive peaks.

4. Wave Properties Amplitude
Amplitude is the height of the wave above or below the equilibrium point.
How loud or strong a wave is.

5. Wave Properties Frequency - the number of waves passing a particular point in one second.
Frequency, f, is Also known as pitch.
Longer wavelength = Lower frequency = red shift
Shorter wavelength = Higher frequency = blue shift

6. DOPPLER EFFECT
Refers to the change in frequency when there is relative motion between an observer of waves and the source of the waves
Doppler with Sound

7. The Doppler Effect
Change in frequency due to relative motion of the source.
Greater the speed of the source, greater the effect.
Stationary bug
Bug swimming

8. Hubble’s Discovery
Hubble observed that the wavelength of light coming from distant galaxies was experiencing redshift .
This means the light source is moving away from the observer and increasing in wavelength (doppler effect).
The longer the light travels, the more it gets redshifted.