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# Waves Study Slides

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1. Waves Study Slides

2. 5 Point Questions 1st question is for your # 4s

3. # 1 A “real life” example of a transverse wave is: • My cat’s meow • Food converting to energy • Color • A dog whistle being blown

4. # 1 Answer A “real life” example of a transverse wave is: • My cat’s meow • Food converting into energy • Color • A dog whistle being blown # 2s…you’re up next

5. # 2 A “real life” example of a longitudinal wave is: • Gamma rays • X-rays • The Color Purple • Sound

6. # 2 Answer A “real life” example of a longitudinal wave is: • Gamma rays • X-rays • The Color Purple • Sound # 1s…you’re up next

7. # 3 Pitch, a measure of a longitudinal wave, has to do with • Amplitude • Frequency • Color • Crests and Troughs

8. # 3 Answer Pitch, a measure of a longitudinal wave, has to do with • Amplitude • Frequency • Color • Crests and Troughs # 3s…you’re up next

9. # 4 Volume, a measure of a longitudinal wave, has to do with • Amplitude • Frequency • Color • Crests and Troughs

10. # 4 Answer Volume, a measure of a longitudinal wave, has to do with • Amplitude • Frequency • Color • Crests and Troughs # 2s…you’re up next

11. # 5 True or False: A Longitudinal wave needs a medium in order to travel. True False

12. # 5 Answer True or False: A Longitudinal wave needs a medium in order to travel. True –Sound is produced by the vibration of two particles/objects, etc. False

13. 10 Point Questions 1st question is for your # 4s

14. # 1 Define Wavelength: • The thickness of a compression • # of waves per second • The distance between two crests or two troughs in a row • How large a wave is

15. # 1 Answer Define Wavelength: • The thickness of a compression • # of waves per second • The distance between two crests or two troughs in a row • How large a wave is # 3s…you’re up next

16. # 2 A Definition of Amplitude is: • The measure from crest to trough • # of waves per second • The distance between two crests or two troughs in a row • The measure of how large a wave is

17. # 2 Answer A Definition of Amplitude is: • The measure from crest to trough • # of waves per second • The distance between two crests or two troughs in a row • The measure of how large a wave is # 1s…you’re up next

18. # 3 How do you measure the amplitude of a transverse wave? • The distance from the line of origin to the crest or the line of origin to the trough. • The distance from a compression to a rarefaction • The # of waves per second • The length from one crest to the next consecutive crest.

19. # 3 Answer How do you measure the amplitude of a transverse wave? • The distance from the line of origin to the crest or the line of origin to the trough. • The distance from a compression to a rarefaction • The # of waves per second • The length from one crest to the next consecutive crest. # 3s…you’re up next

20. # 4 The two pictures below show a change in • Frequency • Amplitude • Color • Wave speed

21. # 4 Answer The two pictures below show a change in • Frequency • Amplitude—Size of compressions • Color • Wave speed # 2s…you’re up next

22. # 5 The following shows a change in A. Amplitude B. Size C. Volume D. Wavelength

23. # 5 Answer The following shows a change in • Amplitude • Size • Volume • Wavelength Next question is for your 4s

24. #6 • The two pictures below show a change in WHAT? Describe. • 1 • 2

25. #6 Answer • The two pictures below show a change in Frequency/Pitch. Picture 1 has a lower frequency, so a lower pitch than Picture 2 • 1 • 2

26. 25 points for the GROUP Picture of water before a rock Picture of water after a Is thrown rock is thrown Explain what happened. Include Amplitude/Frequency, Energy types (if you know them, but I’m not expecting you to), AND wave types!

27. GROUP Answer “before” “after” There is very little energy in the water “before.” A rock, filled with Kinetic Mechanical Energy transfers that energy to the water. The energy flow through the water is still mechanical. Around where the rock hit (the source of energy), the amplitude is high (large waves) and the frequency is high (waves close together). As the energy travels through the water in TRANSVERSE (up and down) waves away from the source, the energy is transferred through all surrounding water and it begins to decrease, thus decreasing in size (amplitude) and frequency (the waves spread out).

28. 20 Point Questions 1st Question is for your 1s

29. # 1 Draw a picture of a longitudinal wave. Label a compression and a rarefaction. Label a wavelength.

30. # 1 Answer Draw a picture of a longitudinal wave. Label a compression and a rarefaction. Label a wavelength. Wavelength (Compression to Compression) ..CompressionRarefaction Amplitude (Thickness of Compression as the wave moves through the medium) # 2s…you’re up next

31. # 2 Draw a picture of a transverse wave. Label: A crest and a trough A wavelength The line of origin Amplitude in one spot

32. # 2 Answer Draw a picture of a transverse wave. Label: A crest and a trough A wavelength The line of origin Amplitude in one spot Crest AMPLITUDE (LINE OF ORGIN TO CREST) Wavelength (Crest to Crest) Trough Line of Origin AMPLITUDE (LINE OF ORGIN TOTROUGH) # 3s…you’re up next

33. # 3 Draw a picture of two transverse waves with a change in Amplitude. Include what an increase in Amplitude would mean for this type of wave in real life.

34. # 3 Answer Draw a picture of two transverse waves with a change in Amplitude SMALLER AMPLITUDE (SMALLER WAVE)LARGER AMPLITUDE (LARGER WAVE) (DIMMER LIGHT) (BRIGHTER LIGHT) # 4s…you’re up next

35. # 4 Explain what happens to Amplitude, Frequency, and wavelength the further you get away from the source. Why?

36. # 4 Answer Explain what happens to Amplitude, Frequency, and wavelength the further you get away from the source. Why? The source is the source of ENERGY. The further you get away from the source of energy, the less energy there is being transferred. The waves get further apart, so frequency decreases (wavelength increases). Thus, light slows down (wave type/color changes) pitch becomes slightly lower…..both over a VERY large distance. Usually frequency change is not noticeable (Doppler effect does not factor in here). Amplitude, or size, decreases substantially. Therefore….light becomes dimmer, sound quieter. # 1s…you’re up next

37. # 5 The following picture shows a change in What? Yes, There is more than one answer here.

38. The following picture shows a change in What? There is more than one answer here. # 5 Answer A B Picture A’s wavelengths are shorter than B. The waves in A are closer together, so the frequency is higher and therefore, so is the pitch. B’s waves are further apart, so frequency is lower (and so is the pitch).

39. 25 Point Questions FOR THE GROUP

40. # 1 Velocity (Speed) = Frequency x Wavelength Calculate the following: 1. A wave is traveling at 37.4 m/s. The Frequency is 15,000 Hz. What is the wavelength? Round to the 1000th. 2. 7 waves pass a fixed point every 12 sec. The waves have a length of 3.4 m. What is the speed of the wave? Round to the nearest 100th.

41. # 1 Answer 1. A wave is traveling at 37.4 m/s. The Frequency is 15,000 Hz. What is the wavelength? Speed = Frequency x Wavelength 37.4 = 15,000 x ? 37.4 = .002 m 15,000 2. 7 waves pass a fixed point every 12 sec. The waves have a length of 3.4 m. What is the speed of the wave? Velocity (Speed) = Frequency x Wavelength ? =(7 waves per 12 sec) x 3.4 m ? = 7 x 3.4 12 1.97 m/s = .58 x 3.4