Doppler Effect

1. If the object emitting waves is moving AWAY from the observer, what happens to the waves?

• the waves get "bunched up" - closer together (and appear at a higher frequency to the observer)  like on the right side of the screen

• the waves get "spread out" - further apart from each other (and appear at a lower frequency to the observer) like on the left side of the screen

2. The horn sounds exactly the same to the driver.  But the car's horn sounds lower to you as the speeds AWAY from you.  This "apparent" change in the sound waves is called:

• The Greenhouse Effect

• The Doppler Effect

• The Coriolis Effect

3. So if the star is moving away from us, and therefore has a lower frequency wavelength, we call this observation:

• redshift

• greenshift

• blueshift

4. If the stars were moving towards the observer, it would be called 

• Red Shift

• Green Shift

• Blue Shift

5. Redshift - the observation that most stars and galaxies are moving away from us, is a result of the Doppler Effect and supports which widely accepted theory?

• Plate Tectonics Theory

• Theory of Evolution

• String Theory

• Big Bang Theory