1. 15.9 WAVES - Review

2. What are the three types of mechanical waves?
Transverse Wave
Longitudinal Wave
Surface Wave

3. Can be any of the three states of matter: Solid, liquid, or gas
What is a medium?
Can be any of the three states of matter:
Solid, liquid, or gas

4. Explain the difference between a traverse wave and a longitudinal wave.
Transverse waves
Move perpendicular to the source
Longitudinal waves
Move in the same direction (parallel) as the source

5. Draw a transverse wave and label the following: Crest, trough, wavelength and amplitude

6. Draw a longitudinal wave and label the following: compression and rarefaction

7. What is the frequency of a wave?
The number of complete cycles in a given time.

8. What is the period of a wave?
The time required for one cycle, a complete motion that returns to it’s starting point.

9. Frequency is measured in_______
Hertz (Hz)

10. The more energy the higher the ________
Amplitude

11. What is reflection?
Reflection
When a wave bounces off a surface at the same angle it approaches.

12. What is diffraction?
Diffraction
The bending of a wave as it moves around an obstacle or passes though a narrow opening.

13. What is refraction?
Refraction
Bending of a wave as it enters a new medium.

14. What is constructive interference?
When waves combine and become larger.

15. What is destructive interference?
When a wave collides and become smaller

16. Define a standing wave
A wave that appears to stay in one place.

17. Calculate the speed of the wave if the wavelength is 50 m and the frequency 34.5 Hz
Speed = Wavelength x frequency
Speed = 50 m x 34.5 hz
Speed = 1,725 m/s

18. Calculate the speed of the wave if the wavelength is 23
Calculate the speed of the wave if the wavelength is 23.4 m and the frequency 100 Hz
Speed = Wavelength x frequency
Speed = 23.4m x 100 hz
Speed = 2,340 m/s

19. Calculate the wavelength of a wave if the speed is 36 m/s and the frequency is 23 Hz
Wavelength = Speed / frequency
Wavelength = 36 m/s / 23 Hz
Wavelength = 1.57 m

20. What is the Doppler Effect?
Apparent shift in pitch due to motion of a sound source

21. What type of wave doesn’t need a medium to travel thru?
Electromagnetic Wave

22. What is the full range of frequencies of electromagnetic radiation called?
Electromagnetic Spectrum

23. How does the intensity change as you move farther from a light source?
The intensity decreases as you move farther from a source

24. What is the full range of waves of the electromagnetic spectrum from longest to shortest wavelength (Lowest to highest frequency)

25. What is the speed of light?
3 x 108 m/s

26. What are the colors, from lowest to highest frequency, in the visible light spectrum?
ROY G. BIV
Red, Orange, Yellow, Green, Blue, Indigo, Violet

27. When all of the colors are absorbed by an object, what color do we see?
Black

28. When all of the colors are reflected by an object, what color do we see?
White

29. Define transparent
A transparent material transmits light, which means it allows the light that strikes it to pass through it.

30. Define translucent
Translucent material scatters light. You can see through the material, but the objects you see through do not look clear.

31. Define opaque
Material absorbs or reflects all of the light that strikes it.

32. Any Questions!!!!
Good Luck and Study !!