Academic Light and Refraction. 1. As a lamp is moved closer to a surface, the illumination on that surface from the lamp will

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1 cademic Light and Refraction Name: Date: 1. s a lamp is moved closer to a surface, the illumination on that surface from the lamp will 1.. decrease. increase. remain the same 2. typical microwave oven produces radiation at a frequency of hertz. What is the wavelength of this microwave radiation? m m m D m 3. ray of monochramatic light is traveling in flint glass. The ray strikes the flint glass-air interface at an angele of incidence greater than the critical andle for flint glass. Which diagram best represents the path of this light ray? D. page1

2 4. The accompanying diagram below shows an antenna emitting an electromagnetic wave. 4. In what way did the electrons in the antenna produce the electromagnetic wave?. by remaining stationary. by moving at constant speed upward, only. by moving at constant speed downward, only D. by accelerating alternately upward and downward 5. What occurs as a ray of light passes from air into water? 5.. The ray must decrease in speed.. The ray must increase in speed.. The ray must decrease in frequency. D. The ray must increase in frequency. 6. ompared to wavelengths of visible light, the wavelengths of ultraviolet light are 6.. shorter. longer. the same 7. Experiments performed with light indicate that light exhibits 7.. particle properties, only. wave properties, only. both particle and wave properties D. neither particle nor wave properties page2 cademic Light and Refraction

3 8. ase your answer(s) to the following question(s) on the information below meter-long electromagnetic (radar) wave is emitted by a weather station and reflected from a nearby thunderstorm. Determine the frequency of the radar wave. [Show all calculations, including the equation and substitution with units.] 9. n astronomer on Earth studying light coming from a star notes that the observed light frequencies are lower than the actual emitted frequencies. The astronomer concludes that the distance between the star and Earth is 9.. decreasing. increasing. unchanging 10. ompared to the wavelength of red light, the wavelength of yellow light is 10.. shorter. longer. the same 11. Which characteristic of electromagnetic radiation is directly proportional to the energy of a photon? 11.. wavelength. period. frequency D. path 12. In a vacuum, all electromagnetic waves have the same 12.. wavelength. frequency. speed D. amplitude 13. ompared to a photon of red light, a photon of blue light has a 13.. greater energy. longer wavelength. smaller momentum D. lower frequency page3 cademic Light and Refraction

4 14. The diagram below shows a ray of light passing from air into glass at an angle of incidence of Which statement best describes the speed and direction of the light ray as it passes into the glass?. Only speed changes.. Only direction changes.. oth speed and direction change. D. Neither speed nor direction changes. 15. ray of monochromatic light is incident on an air-sodium chloride boundary as shown in the diagram below. t the boundary, part of the ray is reflected back into the air and part is refracted as it enters the sodium chloride. 15. ompared to the ray s angle of refraction in the sodium chloride, the ray s angle of reflection in the air is. smaller. larger. the same page4 cademic Light and Refraction

5 16. Which pair of terms best describes light waves traveling from the Sun to Earth? 16.. electromagnetic and transverse. electromagnetic and longitudinal. mechanical and transverse D. mechanical and longitudinal 17. What is the period of a 60.-hertz electromagnetic wave traveling at meters per second? s s s D s 18. ase your answer(s) to the following question(s) on the information and diagram below meter-long segment of an electromagnetic wave having a frequency of hertz is represented below. On the diagram above, mark two points on the wave that are in phase with each other. Label each point with the letter P. 19. television remote control is used to direct pulses of electromagnetic radiation to a receiver on a television. This communication from the remote control to the television illustrates that electromagnetic radiation 19.. is a longitudinal wave. possesses energy inversely proportional to its frequency. diffracts and accelerates in air D. transfers energy without transferring mass 20. stronauts traveling toward Earth in a fast-moving spacecraft receive a radio signal from an antenna on Earth. ompared to the frequency and wavelength of the radio signal emitted from the antenna, the radio signal received by the astronauts has a 20.. lower frequency and a shorter wavelength. lower frequency and a longer wavelength. higher frequency and a shorter wavelength D. higher frequency and a longer wavelength page5 cademic Light and Refraction

6 21. What is characteristic of both sound waves and electromagnetic waves? 21.. They require a medium.. They transfer energy.. They are mechanical waves. D. They are longitudinal waves. 22. In the diagram here a light ray passes obliquely from air into a glass block. Which path represents the refracted ray of light? D. D 23. The diagram shows a ray of light being refracted as it passes from air into glass. Which letter represents the angle of refraction for the light ray? D. D 24. Which diagram best illustrates wave refraction? D. page6 cademic Light and Refraction

7 25. s shown in the diagram, a beam of light can pass through the length of a curved glass fiber. This phenomenon is possible due to the effect of 25.. dispersion. internal reflection. polarization D. diffraction 26. The absolute index of refraction for a substance is 2.0 for light having a wavelength of meter. In this substance, what is the critical angle for light incident on a boundary with air? D 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.] D. page7 cademic Light and Refraction

8 28. The accompanying diagram shows how an observer located at point P on Earth can see the Sun when it is below the observer s horizon. 28. This observation is possible because of the ability of Earth s atmosphere to. reflect light. diffract light. refract light D. polarize light 29. Which diagram best illustrates wave diffraction? D. page8 cademic Light and Refraction

9 30. Which diagram best represents the path of light rays passing through a glass prism? D. 31. The speed of a ray of light traveling through a substance having an absolute index of refraction of 1.1 is m/s m/s m/s D m/s 32. The wavelength of a wave doubles as it travels from medium into medium. ompared to the wave in medium, the wave in medium has 32.. half the speed. twice the speed. half the frequency D. twice the frequency 33. diagram of the electromagnetic spectrum is shown below. 33. Sunscreen is a lotion used to protect skin from exposure to the Sun. This sunscreen protects a person s skin from wavelengths that are. longer than radio waves but shorter than x-rays.. longer than x-rays but shorter than infrared waves.. longer than microwaves but shorter than infrared waves. D. longer than visible light waves but shorter than radio waves. page9 cademic Light and Refraction

10 Problem-ttic format version c Educide Software Licensed for use by Mark Williams Terms of Use at cademic Light and Refraction 04/30/ D 2. D D D D Hz