Final Exam Study Guide Chapter 28
Final Exam Study Guide Chapter 28 PHYS 012
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This 14 page Study Guide was uploaded by Hannah Taylor on Monday May 9, 2016. The Study Guide belongs to PHYS 012 at University of Vermont taught by Jun-Ru Wu in Spring 2016. Since its upload, it has received 173 views. For similar materials see Conceptual Physics in Physics 2 at University of Vermont.
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Date Created: 05/09/16
Rainbows exist because light is ANSWER: reflected. refracted. both of these neither of these Correct Word Analysis Question 28.41 Part A If a fish looks upward at 45 degrees with respect to the water's surface, it will see ANSWER: the bottom of the pond. only the water's surface. another fish in the pond. the sky and possibly some hills. none of these Correct Word Analysis Question 28.28 Part A Figure 28D When the pinhole in a pinhole camera is made larger, the image is ANSWER: clearer. brighter. both neither Correct Word Analysis Question 28.26 Part A The image of the "infinitelyfaraway" sun produced by a converging lens appears ANSWER: beyond the focal point. between the lens and the focal point. at the focal point. Correct Word Analysis Question 28.19 Part A The critical angle is least in which of the following? ANSWER: diamond water vacuum glass Correct Word Analysis Question 28.18 Part A The critical angle for a transparent material is the angle at and beyond which all light within the material is ANSWER: reflected. refracted. absorbed. dispersed. diffused. Correct Word Analysis Question 28.14 Part A Rainbows are not usually seen as complete circles because ANSWER: they have no bottom part. they are actually elliptical. the ground is usually in the way. rainbows are actually arched shaped. raindrops are not perfectly round. Correct Word Analysis Question 28.13 Part A Different colors are dispersed by a prism because different colors in the prism have different ANSWER: frequencies. directions. energies. speeds. none of these Correct Word Analysis Question 28.12 Part A The average speed of light is greatest in ANSWER: green glass. orange glass. blue glass. red glass. is the same in all of these Correct Ranking 28.4 Identical rays of light in air are refracted upon entering three transparent materials: A, water, where the speed of light 0.75c ; B, ethyl alcohol (sp0.7c ); C, crown glass (spee0.6c ). Part A Rank the materials according to how much the light ray bends toward the normal, from most bending to least bending. Rank from most to least. To rank items as equivalent, overlap them. ANSWER: Correct Word Analysis Question 28.1 Part A As a light ray in air at 15 degrees from the normal enters water, it ANSWER: does not bend. always bends away from the normal. sometimes bends towards the normal. always bends toward the normal. Correct Ranking 28.3 Identical rays of light enter three transparent blocks composed of different materials. Light slows down upon entering the blocks. Part A Rank the blocks according to the speed light travels in each, from highest speed to lowest speed. Rank from highest to lowest. To rank items as equivalent, overlap them. ANSWER: Correct Ranking 28.2 Wheels from a toy cart are rolled from a concrete sidewalk onto the following surfaces: A, a paved driveway; B, a grass lawn; C, closecropped grass on a golfcourse putting green. Due to slowing, each set of wheels bends at the boundary and is deflected from its initial straightline course. Part A Rank the surfaces according to the amount each set of wheels bends at the boundary, from greatest amount of bending to least. Rank from greatest to least. To rank items as equivalent, overlap them. ANSWER: Correct Problem 28.6 The diameter of the Sun makes an angle of 0.∘ from Earth. Part A How many minutes does it take the Sun to move 1 solar diameter in an overhead sky? (Remember that it takes 24 hours, or 1440 minutes, for the Sun to move through∘.)0 ANSWER: t = 2.1 min Correct Part B How does your answer compare with the time it takes the Sun to disappear, once its lower edge meets the horizon at sunset? ANSWER: It is the a little longer than time it takes the Sun to disappear. It is the same as the time it takes the Sun to disappear. It is the a little shorter than time it takes the Sun to disappear. Correct Part C Does refraction affect your answer? ANSWER: yes no Correct Problem 28.4 When light strikes glass perpendicularly, %b is reflected at each surface. Part A Find what percent of light is transmitted through a pane of window glass. Express your answer using two significant figures. ANSWER: 94 % Correct Multiple Choice Question 28.22 Part A Figure 28C Two plane mirrors are at right angles to each other. A coin placed near the mirrors has at most ANSWER: 2 images. 4 images. 3 images. more than 4 images. Correct Multiple Choice Question 28.19 Part A The inversion of your image in a plane mirror is actually an inversion of ANSWER: frontback. leftright. updown. all of these Correct Multiple Choice Question 28.13 Part A A diver shines light up to the surface of a smooth pond at a 10degree angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of ANSWER: 10 degrees. more than 10 degrees. less than 10 degrees. Correct Multiple Choice Question 28.11 Part A To see his full height, a boy that is 1 meter tall needs a mirror that is at least ANSWER: 0.75 m tall. 1 m tall. 0.33 m tall. 0.50 m tall. depends on how far the mirror is from the boy Correct Multiple Choice Question 28.9 Part A If you walk towards a mirror at a certain speed, the relative speed between you and your image is ANSWER: twice your speed. your speed. half your speed. none of these Correct Multiple Choice Question 28.8 Part A When light reflects from a surface, there is a change in its ANSWER: frequency. speed. wavelength. all of these none of these Correct Multiple Choice Question 28.5 Part A The amount of light reflected from the front surface of a common windowpane is about ANSWER: 8 percent. 40 percent. 96 percent. 92 percent. 4 percent. Correct Multiple Choice Question 28.4 Part A Object and image for a plane mirror lie ANSWER: along the same plane. equal distances from the mirror. at right angles to each other. all of these none of these Correct Exercise 28.42 Part A When your eye is submerged in water, is the bending of light rays from water to your eyes more, less, or the same as in air? ANSWER: more less the same Correct Problem 28.1 Suppose you walk toward a mirror am/s. . Part A How fast do you and your image approach each other? (The answer ism/st .)8 Express your answer to two significant figures and include the appropriate units. ANSWER: v = 5.6ms Correct Problem 28.5 No glass is perfectly transparent. Mainly because of reflectio%s of light passes through an average sheet of clear windowpane. T%e loss is not noticed through a single sheet, but through several sheets, the loss is apparent. Part A How much light is transmitted by a doublepaned window (one with two sheets of glass)? Express your answer using two significant figures. ANSWER: I = 86 % Correct Multiple Choice Question 28.1 Part A Light is emitted when ANSWER: highfrequency sound waves strike matter. electromagnetic waves emanate from matter. atomic nuclei are made to vibrate. electron clouds of atoms are forced into oscillation. Correct Word Analysis Question 28.8 Part A Light refracts when traveling from air into glass because light ANSWER: has greater frequency in glass than in air. travels slower in glass than in air. has greater intensity in glass than in air. has greater intensity in air than in glass. has greater frequency in air than in glass. Correct Word Analysis Question 28.7 Part A Refraction results from differences in light's ANSWER: speed. incident angles. frequency. all of these none of these Correct Word Analysis Question 28.30 Part A Chromatic aberration is absent in ANSWER: converging lenses diverging lenses. front surface plane mirrors. Correct Word Analysis Question 28.35 Part A A beam of light travels fastest in ANSWER: water. glass. air. plastic. is the same in each of these Correct Word Analysis Question 28.43 Part A A person standing waistdeep in a swimming pool appears to have short legs because of light ANSWER: reflection. absorption. diffraction. interference. refraction. Correct Chapter 28 Prelecture Reading Question 2 Part A Light travels a path from one location to another in the least _______. Hint 1. What is Fermat's principle with regard to light travel? ANSWER: dense material distance energetic path time Correct Chapter 28 Prelecture Reading Question 3 Part A Specular reflection is common in the light reflected from _______. Hint 1. How does specular reflection differ from diffuse reflection? ANSWER: a rough surface a mirror a common road this page Correct
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