1. Monday January 8 Tuesday January 9 Unit QuestionWhat are waves? Guiding Question / Learning Target Identify types of waves and explain how energy and wave behavior are related. Warm-up What happens to a wave’s amplitude if I increase its energy? Agenda 1.Guided Notes 2.Interference Lab Homework QUIZ FRIDAY! Its amplitude will increase!

2. Quiz Retake If you got less than a 6.5 you can retake the quiz for up to 70% credit on Wednesday/Thursday. Before you take the quiz you need to show me your corrected quiz.

3. Half Day Friday No school next Monday and Tuesday

4. Interference When two or more waves overlap and combine (They mess with each other)

5. Constructive interference is when the CREST of one wave overlaps the CREST of another wave (or any positive amplitude overlaps positive amplitude)

6. Constructive interference The new amplitude is bigger

7. Destructive interference is when the crest of one wave overlaps the trough of another (or positive amplitude overlaps negative amplitude)

8. Destructive interference The new amplitude is smaller Destroy!

9. In CONSTRUCTIVE INTERFERENCE, the speed and wavelength stay the same, while the amplitude gets bigger. In DESTRUCTIVE INTEREFERENCE the speed and wavelength stay the same, while the amplitude gets smaller.

10. Label Constructive

11. destructive

12. Standing wave Appears to stay in one place He’s not going anywhere, but he’s still moving (breathing, heart beat, etc...)

13. Node Point of no displacement from rest position (middle) Stays on the middle line There’s NO movement from middle No de = No movement

14. What’s the farthest from a node you can get? The farthest distance from the middle. Antinode Point above or below midline, between nodes It’s not a node.

15. http://www.surendranath.org/Applets/Waves/TWave02/TW 02.html http://www.surendranath.org/Applets/Waves/TWave02/TW 02.html

16. Wave Interference Webquest For the Math part (bottom of page 2), think of it in terms of a graph. Above the axis is +, below is – Your answers though will always be an absolute value, because it’d the DISTANCE away from the middle, not the DIRECTION that matters.

17. Only draw the yellow line

18. Slinky lab first Predict then do Only draw the reflected pulse Wave lab second Predict then do Only draw the yellow line Pages 1& 2 of wave interference DUE before you leave class today! Extra Credit for this week: Read 17.3 and do chapter questions 1-8 Due FRIDAY!

19. Exit Question What type of interference is this? How can you tell?