1. Unit # 4 CDA Review
Light and Sound

2. Unit # 4 CDA Review
1. You are listening to your music and notice that the singer is starting to sing higher and higher notes. What happens to the sound waves as the person starts to sing higher and higher?
C. The frequency increases.
Higher pitch= higher frequency

3. Unit # 4 CDA Review
2. When waves move the particles of a medium in a direction that is parallel to the direction of the wave, what kind of waves are they?
C. Longitudinal Wave.
Compressional wave is also another name for longitudinal wave

4. Unit # 4 CDA Review
3. The diagram below shows an electromagnetic wave traveling in a medium. Which statement below best describes the energy in this wave?
A. The energy is increasing because the frequency is increasing.

5. Unit # 4 CDA Review
4. Which of the following statements about the relationship between the speed of sound and air temperature is true?
B. As air temperature increases,, the speed of sound increases

6. Unit # 4 CDA Review D. Frequency.
5. All of the following affect the speed of sound except:
D. Frequency.
6. Sound waves travel faster through which medium?
C. Solid. Because it has a higher density
7. Sound waves cause molecules to vibrate and bump into each other and the closer the molecules are, the faster the speed of the sound waves. This is why sound waves:
B. Travel faster in steel than in water

7. Unit # 4 CDA Review
8. All the colors of the visible spectrum together make up white light. However, the colors can be separated when
C. the light is refracted by a prism. Refraction- waves bending because they go from one medium into another.
9. When light goes from air and into water, what happens to the light?
A. The light slows down.

8. Unit # 4 CDA Review
10. As a singer increases the frequency of their vocal cords, what is the end result?
C. higher pitch.
11. As a train approaches you blowing its horn its pitch is higher, and its pitch is lower as it is moving away. What is this known as?
A. The Doppler Effect.
A change in pitch due to an objects motion.
When object is moving toward = frequency increases=higher pitch = shorter wavelength
When object moves away = lower frequency= lower pitch = longer wavelength

9. Unit # 4 CDA Review
12. The above diagram is an example of: D. Diffraction.
13. Which of the above graphics has the lowest pitch? A.
Lower frequency 1Hz
14. The amplitude of a sound wave describes the amount of energy in the wave. T

10. Unit # 4 CDA Review
15. Sound waves travel through a medium as a transverse wave.
F Sound is a mechanical compressional wave it needs a medium
16. When light enters the eye and passes through the lens what happens?
A. The light is refracted and forms an image on the retina.

11. Unit # 4 CDA Review
17. The part of the eye that is like the image screen on a camera is: A. Retina.
18. Which part of the eye absorbs visible light waves with the highest frequencies? B. Blue Cones.
Blue wavelength is shorter = higher frequency
19. In what order does light pass through the structures of the eye? A. cornea, pupil, lens, retina.

12. Unit # 4 CDA Review
20. Electromagnetic waves can transfer energy with or without a medium. T
21. Objects have color due to: B. Absorption and reflection.
22. When someone wants a little light to come into the house but does not want people to be able to see clearly inside the house, they want what kind of material C. Translucent.
Opaque- no light can pass through you can not see through it.
Transparent- all light can pass through- totally clear
Translucent- some light can pass through but it is scattered,

13. Unit # 4 CDA Review
23. Which image is an example of light being refracted? A.
24. Below is a figure of a longitudinal wave. Identify parts: A. B. C. and D.
A and D Rarefaction B and C Compression

14. Unit # 4 CDA Review
25. You are walking down the hallway and hear clearly someone talking from a connecting hallway before they round the corner and come into view. What phenomenon allows you to hear the talking before seeing the people?
D. Diffraction.
Diffraction –spreading out of waves around a corner or through a barrier.