1. Review Questions – Unit 4

2. 1. What happens when red light shines on a prism? a. it changes the color of the light into blue and green b. it changes the direction of the beam and the color c. it makes the light reflect back to the opposite direction d. it changes the direction of the light but not the color

3. 2. Explain how the curved surface of a lens affects the transmission of light.

4. 3. Describe a convex lens. A concave lens.

5. 4. Define wave

6. 5. Tell the difference between a longitudinal wave and a transverse wave?

7. 6. Define reflection.

8. 7. Define refraction

9. 8. Define diffraction

10. 9. Describe the differences in the way light and sound waves travel through solids, liquids, and gases. Explain the reasons for these differences:

11. 10. You turn off all the lights and turn the flashlight on in your room. You notice as you shine it against the wall it makes a large circle, but as you approach the wall, the circle of light gets smaller. 1. Why is the circle of light on the wall larger when you are farther away and smaller when you are near? a. The light spreads in all directions from the light bulb of the flashlight. b. The light travels faster the farther you are away from the wall. c. There are more particles of light the farther you are away from the wall, so they make a larger circle. d. The closer to the wall you are, the more the light waves are attracted to each other.

12. 11. 1.Predict which circle of light would be brighter, the small circle when you are near the wall or the large circle when you are farther from the wall. a. Both are the same since they flashlight is brand new. b. It would be different depending on what was on the surface of the wall, like light paint, dark paint, or wallpaper. c. The small circle would be brighter. d. The large circle would be brighter.

13. 12. What would happen if you reduced the frequency of a sound wave? a. the sound would be louder b. the sound would be softer c. the sound would be at a higher pitch d. the sound would be at a lower pitch

14. 13. Which of these describes the movement of the medium from a sound wave? a. forward and backward parallel to the direction of the wave b. side to side perpendicular to the direction of the wave c. rolling motion parallel to the direction of the wave d. it depends on the particular medium

15. 14. Which of these is an example of how energy spreads from an energy producing source? a. a glass of water spilled on the floor b. light from a candle c. a laser beam reflected by a mirror d. a flame burning a piece of paper

16. 15. During an earthquake, the land can begin to lift and fall. What type of wave would this represent? a. longitudinal b. surface wave c. transverse d. wavelength

17. 16. List at least 2 similarities and 2 differences between light and sound waves.

18. 17. Explain how the electromagnetic spectrum is arranged.

19. 18. In science, what are the primary colors?

20. 19. Explain white light.