1. Do Now Heading: The Doppler Effect
Take your seat
Take out your journal
Turn in the lab if you did not yesterday

2. Write/Answer the following
What do you think is the difference between sound A and sound B?
( Use the words wavelength and frequency in your answer)

3. Answer the following
Billy yells into a dark cave. 3 seconds later his friend standing next to him hears what Billy yelled. How is this possible? Describe what you think happened?

4. What is an Echo?

5. Write/Answer the following
Sometimes echo's come back to us with a higher or lower pitch. What do you think happened to the original wavelength to cause this change?

6. The Doppler Effect

7. The Doppler Effect

8. 2 Common Cases for Doppler Effect
Everyday Sound
Astronomy

9. Everyday Sound
Sound A Sound B Write down a description for each sound after you hear them. What do you think is the difference between Sound A and Sound B? What is similar about both of these sounds?

10. The Doppler Effect and Fire Trucks

11. The Doppler Effect and Fire Trucks
If the truck is moving towards you the wavelength ________________. This means the frequency ____________. So the siren has a ______________ pitch.

12. The Doppler Effect and Fire Trucks
If the truck is moving away from you the wavelength ________________. This means the frequency ____________. So the siren has a ______________ pitch.

13. The Doppler Effect in Astronomy
Which color in the visible light spectrum has the largest wavelength? Which color in the visible light spectrum has the highest frequency?

14. The Red Shift and Blue Shift
Stars and Galaxies emit light. Astronomers observe these different light to help determine whether galaxies are moving away from us or towards us.

15. The Red Shift and Blue Shift

16. The Red Shift

17. The Blue Shift

18. Exit Slip
Cally is walking home one day and sees a ball of light moving towards her. She thinks this is the coolest thing ever and runs right home to tell her friends. She tells her friends that the ball of light looks slightly red. Do you think Cally’s description is correct? Use what you have learned today to help you explain why she might be correct or incorrect.