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Wave Interference Quiz Retake and Half Day Announcement

If you scored less than 6.5 on the quiz, you can retake it for up to 70% credit. Half Day on Friday. No school on Monday and Tuesday due to interference. Learn about constructive and destructive interference, standing waves, nodes, and antinodes. Complete the assigned webquest and extra credit reading and homework.

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Wave Interference Quiz Retake and Half Day Announcement

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  1. 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. Destroy! • Destructive interference • The new amplitude is smaller

  9. In CONSTRUCTIVE INTERFERENCE, thespeed and wavelengthstay the same, while the amplitudegets 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. There’s NO movement from middle • Node • Point of no displacement from rest position (middle) • Stays on the middle line No de = movement No

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

  15. http://www.surendranath.org/Applets/Waves/TWave02/TW02.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. Extra Credit for this week: Read 17.3 and do chapter questions 1-8 Due FRIDAY! • 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!

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

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