2. Science 9 Chapter 12

3. 100 200 400 300 400 SOUNDLIGHT REFLECTIONREFRACTION 300 200 400 200 100 500 100

4. Row 1, Col 1 Sound waves are what type of wave? longitudinal

5. 1,2 What is the spectrum called that includes all possible kinds of light? Electromagnetic spectrum

6. 1,3 State the Law of Reflection. The angle of incidence = the angle of reflection

7. 1,4 The bending of light as it passes through different mediums. What is refraction?

8. 2,1 What determines the speed of sound? The MEDIUM it travels through.

9. 2,2 If you are nearsighted (can’t see far), what type of lenses do you need? diverging

10. 2,3 What type of mirror do stores use to be able to see around corners? convex

11. 2,4 Which type of lens brings light rays together? converging

12. 3,1 What is frequency measured in? hertz (Hz)

13. 3,2 Light waves produce color. The color we see is that wavelength being absorbed. TRUE or FALSE? False, the color we see is the REFLECTED wavelength.

14. 3,3 What are the two types of reflection we talked about? (think of the surfaces light reflects off of) Smooth surface and diffuse reflection

15. 3,4 When light moves from a medium in which the speed changes from fast to slow, the ray bends ________ the normal. toward

16. 4,1 What frequency range can humans hear? 20 Hz – 20,000 Hz

17. 4,2 Mediums and/or lenses Refraction occurs when light passes through different ___________

18. 4,3 If a light ray comes in at 30° to the normal, what is the angle of reflection? 30°

19. 4,4 What main part of the eye refracts light? lens

20. 5,1 Small instruments: high pitch, high frequency, short wavelength. Large instruments: low pitch, low frequency, longer wavelength Describe PITCH, FREQUENCY, and WAVELENGTH in terms of musical instruments.

21. 5,2 What are the three primary colors of light? Red, green, blue

22. 5,3 Flat mirrors form what type of image? Virtual images

23. 5,4 Explain how a mirage is formed. When heat from the ground is trapped by the cool air above it. (temperature differences between air and ground)