1. Chapter 23 Physical Science
WAVES
Chapter 23
Physical Science

2. REVIEW OF WAVES

3. Waves transfer what?
ENERGY!!!!

4. What are the two main types of waves?
MECHANICAL WAVES
ELECTROMAGNETIC WAVES

5. Which type of wave requires a medium?
MECHANICAL WAVES
Electromagnetic waves do NOT
need a medium.

6. What are 3 examples of Mechanical Waves?
Water waves
Sound waves
Seismic waves

7. What are some examples of Electromagnetic Waves?
Radio waves

8. Microwaves

9. Infrared light
Visible light
Ultraviolet light

10. X-rays
Gamma Rays

11. What are the colors of Visible Light?
R O Y G B I V

12. R O Y G B I V
RED
ORANGE
YELLOW
GREEN
BLUE
INDIGO
VIOLET

13. Which color is the HIGHEST energy wave?
VIOLET

14. Which color is the LOWEST energy wave?
RED

15. What 3 characteristics do All Waves have?
Amplitude
Wavelength
Frequency

16. What does the size of the amplitude of a wave tell us?
HIGH AMPLITUDE = HIGH AMOUNTS OF ENERGY
LOW AMPLITUDE = LOW AMOUNTS OF ENERGY

17. What unit do we use to measure Wavelengths in?
Meters

18. What greek letter do we use to represent a wavelength?
Lambda 

19. What are the 3 units we can use for Frequency of a wave?
Waves / second
Cycles / second
1/s = Hertz (Hz)

20. Name the 2 types of Mechanical waves.
TRANSVERSE WAVES
LONGITUDINAL WAVES

21. Which type of wave form crests and troughs?
TRANSVERSE

22. COMPRESSIONS RAREFACTIONS
Longitudinal wave do not have crests and troughs, instead they have what?
COMPRESSIONS
RAREFACTIONS

23. How does the medium move when a longitudinal wave moves through it?
The medium vibrates horizontally.

24. Surface Waves move both horizontally and vertically simultaneously, which produces what kind of movement?
Circular

25. Speed of Waves What is the wave equation?
V = f 
speed = frequency times wavelength

26. The speed of a wave is held constant within a medium
The speed of a wave is held constant within a medium. So what effect on the wavelength of a wave would you expect if the frequency were doubled?
The wavelength would half as much. When frequency goes up the wavelength must go down.

27. The density of water is 1 g/ml and the density of syrup is 3 g/ml
The density of water is 1 g/ml and the density of syrup is 3 g/ml. Which of the above would you expect a wave to travel the slowest through?
A wave would travel the slowest through the SYRUP.
Waves travel slower through dense mediums.

28. A slinky is a very elastic object
A slinky is a very elastic object. Explain why this is used to demonstrate wave motion instead of an object like a tree branch?
A slinky has HIGH ELASTICITY !
The higher the elasticity the higher the speed of a wave traveling through it.

29. Name the 4 ways waves interact.
Reflection
Refraction
Diffraction
Interference

30. Explain reflection of a wave.
Bouncing back of a wave after it strikes a boundary.

31. Explain Refraction.
The change in path of a wave when it moves into a medium of a different density.

32. Explain Diffraction.
The curving of waves around barriers and ability of waves to spread out in circular pattern after passing through a narrow opening. See picture below.

33. What are the 2 types of Interference?
Constructive
Destructive

34. Which of the pictures below is an example of Constructive Interference?
The picture on the left is constructive interference.
The picture on the right is destructive interference.

35. Nodes and Antinodes are parts of what kind of wave?
Standing Wave

36. The frequency at which a standing wave occurs is called what?
Resonant Frequency
Sometimes called Natural Frequency.

37. The End of the Waves Review.