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Unformatted text preview: huang (jwh2377) – Homework 1 – lang – (58650) 1 This printout should have 56 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points If the frequency of an electromagnetic wave is 1 × 10 6 Hz what is the wavelength? Answer in units of nm. 002 (part 2 of 2) 10.0 points What type of electromagnetic wave is this? 1. gamma rays 2. ultraviolet 3. visible light 4. Xrays 5. radio wave 6. infrared 7. microwave 003 10.0 points Of the following which type of electromag netic wave has the longest wavelength? 1. Xrays. 2. microwaves. 3. FM radio waves. 4. red light. 5. violet light. 6. Gamma rays. 7. AM radio waves. 004 (part 1 of 2) 10.0 points Unpolarized white light is incident on a po larizer and then falls on an analyzer whose TA (Transmission Axis) makes an angle of θ = 22 ◦ with the polarizer. What is the fraction of the original light transmitted through both the polarizer and analyzer? 005 (part 2 of 2) 10.0 points If the analyzer is rotated until the transmit ted intensity is 40 . 1 percent of the original light intensity, what is the new angle of the analyzer with respect to the polarizer? Answer in units of ◦ . 006 10.0 points When light passes from air into water, the frequency of the light remains the same. What happens to the speed and the wave length of the light as it crosses the boundary in going from air into water? Speed Wavelength 1. Increases Remains the same 2. Decreases Increases 3. Remains the same Decrease 4. Remains the same Remains the same 5. Decreases Decreases 007 (part 1 of 3) 10.0 points Consider a light ray which enters from air to a liquid, where the index of refraction of the liquid is given by n = 1 . 4. Consider the following three ratios, where each is defined by the specified quantity in the liquid, λ ′ , f ′ , and v ′ , to that in the air, λ, f, and c . n = 1 1 . 4 Air Liquid light ray What is the ratio of their wavelengths, λ ′ λ ? 008 (part 2 of 3) 10.0 points huang (jwh2377) – Homework 1 – lang – (58650) 2 What is the ratio of their frequencies of oscil lations, f ′ f ? 009 (part 3 of 3) 10.0 points What is the ratio of the traveling speeds, v ′ c ? 010 (part 1 of 2) 10.0 points A ray always intersects its wave front at right angle. 1. False 2. True 011 (part 2 of 2) 10.0 points Wave fronts are closer together where the in dex of refraction is smaller. 1. False 2. True 012 10.0 points X Y When light travels from medium “X” to medium “Y” as shown in the figure: 1. both the speed and the wavelength de crease 2. both the speed and the frequency in crease 3. both the speed and the frequency de crease 4. both the speed and the wavelength in crease 5. both the wavelength and the frequency are unchanged 013 10.0 points A ray of light is incident at an angle of 35 . 3 ◦ on the surface of a piece of crown glass whose index of refraction is 1 . 52 ....
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 Spring '10
 LANG
 Work, Light, Total internal reflection

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