1. Sound of Music Learning check! #2

2. 1. What is the approximate value of the refractive index of glass? A. 1.3 B. 0.13 C. 13.3 D. 133

3. 2.Which light ray correctly shows the path of the refracted ray? A.A. B. C. D. glass air

4. 3. Which is unchanged by refraction A. Frequency B. Velocity C. WavelengthD. Wombats

5. 4.What is the unit of refractive index? A. o B. m C. No unit D. ms -1

6. 5. The speed of light in a vacuum is approximately A. 3.00x10 6 ms -1 B. 3.00x10 7 ms -1 C. 3.00x10 8 ms -1 D. 3.00x10 9 ms -1

7. 6. Snell’s law states A.  = sin i/sin r B. sin  = sin r/sin i C. sin  = i/ r D. i / sin r = v 2 /v 1

8. 7. Water has a refractive index of 1.33. Light is incident at 60 o. What is the angle of refraction ? A. 50 o B. 41 o C. 55 o D. 32 o

9. 8. Diamond has a refractive index of 2.42. Light is incident at 60 o. What is the angle of refraction ? A. 45 o B. 12 o C. 37 o D. 21 o

10. 9.A balloon is filled with carbon dioxide. The balloon will naturally sink. What would happen to sound waves passing through? A. They will bend inwards B. They will bend outwards C. Nothing D. No sound can pass through

11. 10. Light passes from air to glass. Which statement is true ? A. Its wavelength decreases B. Its amplitude increase C. Its velocity increases D. Its wavelength increases