1. Waves Study Slides

2. 1 Tally Questions

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

5. # 2 A “real life” example of a longitudinal wave is: Gamma rays X-rays
The Color Purple
The bell at the end of class

6. # 2 Answer A “real life” example of a longitudinal wave is: Gamma rays
X-rays
The Color Purple
The bell at the end of class

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

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

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.

13. #6 1 2 3
Describe the surface/object in which light is shining on in each picture.

14. #6 answer 1 2 3
Describe the surface/object in which light is shining on in each picture.
1- Opaque. No light is getting through.
2- Translucent. Some light is getting through.
3. Transparent. Light gets through easily.

15. #7
Why do our eyes see the color Red?

16. #7 Answer Why do our eyes see the color Red?
As light is transmitted, it is either reflected or absorbed. If something is red, it is because all colors are absorbed, but red is the only color reflected.

17. 2 Tally Questions

18. # 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

19. # 1 Answer Define Wavelength:
The thickness of a compression (how you calculate amplitude of a longitudinal wave)
# of waves per second (frequency of any wave)
The distance between two crests or two troughs in a row
How large a wave is (general definition of amplitude)

20. # 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

21. # 2 Answer A Definition of Amplitude is:
The measure from crest to trough (I made this up…this is not a measure)
# of waves per second (Frequency of any type of wave)
The distance between two crests or two troughs in a row (Wavelength of a transverse wave)
The measure of how large a wave is

22. # 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.

23. # 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.

24. # 4 The two pictures below show a change in Frequency Amplitude Color
Wave speed

25. # 4 Answer The two pictures below show a change in Frequency
Amplitude—Definition/intensity of compression
Color
Wave speed

26. # 5
The following shows a change in
A. Amplitude
B. Size
C. Volume
D. Wavelength

27. # 5 Answer The following shows a change in Amplitude Size Volume
Wavelength **And frequency! (as one increases in wavelength, it decreases in frequency (and vice versa).

28. #6
The two pictures below show a change in WHAT? Describe. 1 2

29. #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

30. #7
Contrast the speed of light and the speed of sound through different media.
*Where does it travel fastest, slowest?

31. #7 Answer
Contrast the speed of light and the speed of sound through different media.
*Where does it travel fastest, slowest?
Light Sound
Light—the more matter the harder it is to travel.
Sound—The more matter, the easier it is to pass along energy and vibrate.
Fastest Slowest
Vacuum, Gas, Liquid, Solid
Solid, Liquid, Gas (doesn’t travel in a vacuum)

32. 4 Tally Questions

33. # 1
Draw a picture of a longitudinal wave. Label a compression and a rarefaction. Label a wavelength.

34. # 1 Answer
Draw a picture of a longitudinal wave. Label a compression and a rarefaction. Label a wavelength.
Wavelength (Compression to Compression)
..Compression Rarefaction
Amplitude (Thickness of Compression as the wave moves through the medium)

35. # 2 Draw a picture of a transverse wave. Label: A crest and a trough
A wavelength
The line of origin
Amplitude in one spot

36. # 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 TO TROUGH)

37. # 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.

38. # 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)

39. # 4
Explain what happens to Amplitude, Frequency, and wavelength the further you get away from a light source. Why?

40. # 4 Answer
Explain what happens to Amplitude, Frequency, and wavelength the further you get away from a light source. Why?
The source is the source of ENERGY. The further you get away from the source of energy, the less energy there is. Usually frequency and wavelength change is not noticeable (Doppler effect does not factor in here as that is just an EFFECT, it is not a true change in frequency). Amplitude, or size, decreases substantially. Therefore….light becomes dimmer, sound quieter.

41. # 5 The following picture shows a change in What?
Yes, There is more than one answer here.

42. # 5 Answer 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).

43. # 6
There are 4 ways light can interact.
What are they. Describe.

44. # 6 Answer There are 4 ways light can interact.
What are they. Describe.
Reflection---Light bounces back at the same angle it hits an object. *Mirrors/echo
Refraction---Light bends due to entering an other medium (gas to liquid). Objects appear bent.
Diffraction---Light spreads out around obstacles. *If light/sound CAN get out, it will.
Interference---Constructive—Joins waves to become brighter. Destructive---Waves intersect and objects are harder to see.

45. 5 Tally Questions
FOR THE GROUP

46. # 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 thousandth.
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.

47. # 1 Answer 37.4 = .002 m 15,000 Speed = Frequency x Wavelength
1. A wave is traveling at 37.4 m/s. The Frequency is 15,000 Hz. What is the wavelength?
Speed = Frequency x Wavelength
= 15, x ?
= 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 m
? = x 12
1.98 m/s = x

48. 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, AND wave types!

49. GROUP Answer “before” “after”
There is very little energy in the water “before.” A rock, filled with Kinetic Mechanical Energy transfers its energy to the water. The energy flowing 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). Frequency SHOULD remain the same, but if objects or substances interfere (changing the density of the medium), or the energy transfers to a different medium, that affects the speed of the wave (which affects the frequency).