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electrical power to deliver 665, 1620, or 2285 lm in its three settings The bulb is placed 80 cm above a sheet of paper If an illumination of at least 175 lx is needed on the paper, what is the minimum setting that should be used
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absorbs blue and green light a Why does red cellophane look red in reflected light b Why does red cellophane make a white lightbulb look red when you hold the cellophane between your eye and the lightbulb c What happens to the blue and green light
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56 Earth s Speed Ole Roemer found that the average
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increased delay in the disappearance of Io from one orbit around Jupiter to the next is 13 s a How far does light travel in 13 s b Each orbit of Io takes 425 h Earth travels the distance calculated in part a in 425 h Find the speed of Earth in km/s c Check to make sure that your answer for part b is reasonable Calculate Earth s speed in orbit using the orbital radius, 15 108 km, and the period, 10 yr
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49 You put a piece of red cellophane over one
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flashlight and a piece of green cellophane over another You shine the light beams on a white wall What color will you see where the two flashlight beams overlap
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57 A student wants to compare the luminous flux of a
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lightbulb with that of a 1750-lm lamp The lightbulb and the lamp illuminate a sheet of paper equally The 1750-lm lamp is 125 m away from the sheet of paper; the lightbulb is 108 m away What is the lightbulb s luminous flux
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50 You now put both the red and green cellophane
pieces over one of the flashlights in Problem 49 If you shine the flashlight beam on a white wall, what color will you see Explain
51 If you have yellow, cyan, and magenta pigments,
how can you make a blue pigment Explain
58 Suppose that you wanted to measure the speed of
light by putting a mirror on a distant mountain, setting off a camera flash, and measuring the time it takes the flash to reflect off the mirror and return to you, as shown in Figure 16-24 Without instruments, a person can detect a time interval of about 010 s How many kilometers away would the mirror have to be Compare this distance with that of some known distances
52 Traffic Violation Suppose that you are a traffic
officer and you stop a driver for going through a red light Further suppose that the driver draws a picture for you (Figure 16-23) and explains that the light looked green because of the Doppler effect when he went through it Explain to him using the Doppler shift equation just how fast he would have had to be going for the red light ( 645 nm), to appear green ( 545 nm) Hint: For the purpose of this problem, assume that the Doppler shift equation is valid at this speed
Red light Looks green vcar
Mirror d
Figure 16-23
Figure 16-24
Mastering Problems
161 Illumination
53 Find the illumination 40 m below a 405-lm lamp 54 Light takes 128 s to travel from the Moon to Earth
What is the distance between them
physicsppcom/chapter_test
162 The Wave Nature of Light
59 Convert 700 nm, the wavelength of red light, to
meters
60 Galactic Motion How fast is a galaxy moving
relative to Earth if a hydrogen spectral line of 486 nm is red-shifted to 491 nm
16 Assessment
61 Suppose that you are facing due east at sunrise
Sunlight is reflected off the surface of a lake, as shown in Figure 16-25 Is the reflected light polarized If so, in what direction
Thinking Critically
70 Research Why did Galileo s method for measuring
the speed of light not work
71 Make and Use Graphs A 110-cd light source is
10 m from a screen Determine the illumination on the screen originally and for every meter of increasing distance up to 70 m Graph the data a What is the shape of the graph b What is the relationship between illuminance and distance shown by the graph
72 Analyze and Conclude If you were to drive at
sunset in a city filled with buildings that have glass-covered walls, the setting Sun reflected off the building s walls might temporarily blind you Would polarizing glasses solve this problem
Figure 16-25
62 Polarizing Sunglasses In which direction should
the transmission axis of polarizing sunglasses be oriented to cut the glare from the surface of a road: vertically or horizontally Explain
Writing in Physics
73 Write an essay describing the history of human
understanding of the speed of light Include significant individuals and the contribution that each individual made
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