1. Which diagram best represents the reflection of light from an irregular surface?

Transcription

1 waves Name 02-JUN Which diagram best represents the reflection of light from an irregular surface? In a vacuum, a monochromatic beam of light as a frequency of 6.3 X hertz. What color is the light? 1. red 3. green 2. yellow 4. blue 3. A beam of light crosses a boundary between two different media. Refraction can occur if 1. the angle of the incidence is 0 degrees 2. there is no change in the speed of the wave 3. the media have different indices off refraction 4. all of the light is reflected 4. The diagram shows with light being dispersed as it passes from air into a glass prism. This phenomenon occurs because, in glass, each frequency of light has a different 1. intensity 3. angle of incidence 2. amplitude 4. absolute index of refraction

2 5. The distance from the Moon to the Earth is 3.9 X 10 8 meters. What is the time required for a light ray to travel from the Moon to Earth? s s s s 6. Parallel light rays are incident on the surface of a plane mirror. Upon reflection from the mirror, the light rays will 1. converge 3. be parallel 2. diverge 4. be scattered 7. In the diagram, a ray of monochromatic light reaches the boundary between medium X and air and follows the path shown. Which medium is most likely medium X? 1. Diamond 3. Lucite 2. flint glass 4. water 8. Which phenomenon can not be exhibited by longitudinal waves? 1. reflection 3. diffraction 2. refraction 4. polarization 9. A ray of light traveling in crown glass is incident on a diamond interface at an angle of 30', as shown in the diagram. The angle of refraction for the light ray is closest to

3 1. 12' 3. 30' 2. 18' 4. 53' 10. As the color of light changes from red to yellow, the frequency of the light 1. decreases 3. remains the same 2. increases 11. If all parts of a light beam have a constant phase relationship, with the same wavelength and frequency, the light beam is 1. monochromatic and coherent 3. polychromatic and coherent 2. monochromatic and incoherent 4. polychromatic and incoherent 12. A monochromatic beam of light has a frequency of hertz. What color is the light? 1. yellow 3. violet 2. orange 4. blue 13. What is the measure of the angle of refraction? [Use a protractor or a mathematical calculation.]

4 o The speed of the light in Lucite is

5 m/s m/s X 10 8 m/s m/s 15. The critical angle for the Lucite-air boundary is approximately

6 o A light ray is incident on a plane mirror as shown in the diagram. Which ray best represents the reflected ray? 1. A 3. C 2. B 4. D 17. What occurs as a ray of light passes from air into water?

7 1. The ray must decrease in speed. 2. The ray must increase in speed. 3. The ray must decrease in frequency. 4. The ray must increase in frequency. 18. The diagram shows a ray of light passing from medium X into air. What is the absolute index of refraction of medium X? In the diagram, a ray of monochromatic light (A) and a ray of polychromatic light (B) are both incident upon an air-glass interface. Which phenomenon could occur with ray B, but not with ray A? 1. dispersion 3. polarization 2. reflection 4. refraction 20. If the critical angle for a substance is 44'. the index of refraction of the substance is equal to

8 21. The diagram represents the path of periodic waves passing from medium A into medium B. As the waves enter medium B, their speed 1. decreases 3. remains the same 2. increases 22. A beam of green light may have a frequency of X 10-7 Hz X 10 8 Hz X 10 2 Hz X Hz 23. Compared to wavelengths of visible light, the wavelengths of ultraviolet light are 1. shorter 3. the same 2. longer 24. The accompanying diagram shows a ray of light passing through two media. When the wave travels from medium A into medium B, its speed 1. decreases 3. remains the same 2. increases 25. The accompanying diagram shows light rays in air about to strike a glass window.

9 When the rays reach the boundary between the air and the glass, the light is 1. totally refracted 2. totally reflected 3. partially reflected and partially diffracted 4. partially reflected and partially refracted 26. Which diagram best illustrates wave diffraction? 27. Which diagram best represents the path of light rays passing through a glass prism?

10 28. A ray of monochromatic light traveling in air enters a rectangular glass block obliquely and strikes a plane mirror at the bottom. Then the ray travels back through the glass and strikes the air-glass interface. Which diagram best represents the path of this light ray? [N represents the normal to the surface.] 29. A ray of monochromatic light is traveling in flint glass. The ray strikes the flint glass-air interface at an angle of incidence greater than the critical angle for flint glass. Which diagram best represents the path of this light ray?

11 30. A ray of light strikes a plane mirror at an angle of incidence equal to 35 o. The angle between the incident ray and the reflected ray is 1. 0 o o o o 31. A ray of light ( = 5.9 X 10-7 meter) traveling in air is incident on an interface with medium X at an angle of 30. o. The angle of refraction for the light ray in medium X is 12. o. Medium X could be 1. alcohol 3. diamond 2. corn oil 4. flint glass 32. The diagram shows a ray of monochromatic light incident on an alcoholflint glass interface. What occurs as the light travels from alcohol into flint glass? 1. The speed of the light decreases and the ray bends toward the normal. 2. The speed of the light decreases and the ray bends away from the normal. 3. The speed of the light increases and the ray bends toward the normal. 4. The speed of the light increases and the ray bends away from the normal.

12 33. The diagram shows straight wave fronts passing through an opening in a barrier. This wave phenomenon is called 1. reflection 3. polarization 2. refraction 4. diffraction 34. The absolute index of refraction for a substance is 2.0 for light having a wavelength of 5.9 x 10-' meter. In this substance, what is the critical angle for light incident on a boundary with air? ' 2. 60' 4. 90' 35. A ray of monochromatic light (wavelength= 5.9 x 10-7 meter) traveling in air is incident on an interface with a liquid at an angle of 45", as shown in the diagram below. If the absolute index of refraction of the liquid is 1.4, the angle of refraction for the light ray is closest to ' '

13 ' ' 36. Which phenomenon can occur with light, but not with sound? 1. interference 3. refraction 2. polarization 4. the Doppler effect 37. Which diagram best represents light emitted from a coherent light source? 38. The speed of light in glycerol is approximately x 10 7 m/s x 10 8 m/s x 10 8 m/s x 10 8 m/s 39. Light travels through a solution. If the absolute index of refraction of the solution is increased, the critical angle will 1. decrease 3. remain the same 2. increase 40. A beam of monochromatic light crosses a boundary from air into Lucite at an angle of incidence of 45'. The angle of refraction is approximately 1. 63' 3. 37' 2. 56' 4. 28' 41. The speed of light in a material is 2.5 x 10 8 meters per second. What is the absolute index of refraction of the material? A laser beam does not disperse as it passes through a prism because the

14 laser beam is 1. monochromatic 3. polarized 2. polychromatic 4. longitudinal 43. In the diagram, monochromatic light in air is about to travel through crown glass, water, and diamond. In which substance does the light travel the slowest? 1. air 3. water 2. diamond 4. crown glass