College Physics:
11th Edition
ISBN: 9781305965515
Author: SERWAY, Raymond A.
Publisher: Brooks/Cole Pub Co
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Chapter 22, Problem 13CQ
To determine
Why do astronomers looking at distant galaxies talk about looking backward in time.
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A light-year is the distance that light can travel in one year. Similarly, we can define a light-second, light-day, etc. as the distance that light can travel in other time intervals. Calculate the distance represented by each of the following: (Assume that the speed of light is 3 × 108 m/s).
1. 4 light-seconds
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When we look at the Sun, we are seeing it as it was 8 minutes ago. So we can only see the Sun “in the past.” When you look at the back of your own hand, do you see it “now” or in “the past”?
Chapter 22 Solutions
College Physics:
Ch. 22.2 - Which part of Figure 22.3, (a) or (b), better...Ch. 22.2 - Prob. 22.2QQCh. 22.3 - A material has an index of refraction that...Ch. 22.3 - As light travels from a vacuum (n = 1) to a medium...Ch. 22 - Prob. 1CQCh. 22 - A ray of light passes from one material into a...Ch. 22 - Prob. 3CQCh. 22 - Prob. 4CQCh. 22 - Determine whether each of the following statements...Ch. 22 - A type of mirage called a pingo is often observed...
Ch. 22 - In dispersive materials, the angle of refraction...Ch. 22 - The level of water in a clear, colorless glass can...Ch. 22 - Prob. 9CQCh. 22 - Light in medium A undergoes a total internal...Ch. 22 - Prob. 11CQCh. 22 - Try this simple experiment on your own. Take two...Ch. 22 - Prob. 13CQCh. 22 - Prob. 14CQCh. 22 - A light ray containing both blue and red...Ch. 22 - During the Apollo XI Moon landing, a...Ch. 22 - Prob. 2PCh. 22 - Prob. 3PCh. 22 - Prob. 4PCh. 22 - Prob. 5PCh. 22 - Find the speed of light in (a) water, (b) crown...Ch. 22 - A ray of light travels from air into another...Ch. 22 - Prob. 8PCh. 22 - An underwater scuba diver sees the Sun at an...Ch. 22 - Prob. 10PCh. 22 - A laser beam is incident at an angle of 30.0 to...Ch. 22 - Light containing wavelengths of 400. nm, 500. nm,...Ch. 22 - A ray of light is incident on the surface of a...Ch. 22 - Prob. 14PCh. 22 - The light emitted by a helium-neon laser has a...Ch. 22 - Figure P22.16 shows a light ray traveling in a...Ch. 22 - Prob. 17PCh. 22 - A ray of light strikes a flat, 2.00-cm-thick block...Ch. 22 - Prob. 19PCh. 22 - Prob. 20PCh. 22 - A man shines a flashlight from a boat into the...Ch. 22 - A narrow beam of ultra-sonic waves reflects off...Ch. 22 - A person looking into an empty container is able...Ch. 22 - Prob. 24PCh. 22 - Prob. 25PCh. 22 - Prob. 26PCh. 22 - An opaque cylindrical tank with an open top has a...Ch. 22 - A certain kind of glass has an index of refraction...Ch. 22 - The index of refraction for red light in water is...Ch. 22 - The index of refraction for crown glass is 1.512...Ch. 22 - A light beam containing red and violet wavelengths...Ch. 22 - Prob. 32PCh. 22 - A ray of light strikes the midpoint of one face of...Ch. 22 - For light of wavelength 589 nm. calculate the...Ch. 22 - Repeat Problem 34, but this time assume the...Ch. 22 - A beam of light is incident from air on the...Ch. 22 - Prob. 37PCh. 22 - Prob. 38PCh. 22 - A light ray is incident normally to the long face...Ch. 22 - Prob. 40PCh. 22 - A room contains air in which the speed of sound is...Ch. 22 - Prob. 42PCh. 22 - The light beam in Figure P22.43 strikes surface 2...Ch. 22 - Prob. 44PCh. 22 - A layer of ice having parallel sides floats on...Ch. 22 - A ray of light is incident at an angle 30.0 on a...Ch. 22 - When a man stands near the edge of an empty...Ch. 22 - Prob. 48APCh. 22 - Refraction causes objects submerged in water to...Ch. 22 - A narrow beam of light is incident from air onto a...Ch. 22 - Prob. 51APCh. 22 - Endoscopes are medical instruments used to examine...Ch. 22 - A piece of wire is bent through an angle . The...Ch. 22 - Prob. 54APCh. 22 - Prob. 55APCh. 22 - Prob. 56APCh. 22 - Prob. 57APCh. 22 - Students allow a narrow beam of laser light to...Ch. 22 - Prob. 59APCh. 22 - Three sheets of plastic have unknown indices of...Ch. 22 - A person swimming underwater on a bright day and...Ch. 22 - Prob. 62AP
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- When you look at distant galaxy through a telescope, how is it that you are looking backward in time?arrow_forwardAbout how fast does light travel through empty space? Group of answer choices Light cannot travel through empty space. 300 million meters per second 186 million miles per second 300 million kilometers per hourarrow_forwardApproximately how many times could light travel around the Earth in one second? 5 times 7 times 70 times 1 timearrow_forward
- The speed of light in free space has been measured to be 2.99792458 × 10^8 (A) 3 Significant Figures (B) 5 Significant Figures (C) 7 Significant Figuresarrow_forwardThe Hydra galaxy is moving away from Earth at 6 x 10^7 m/s. What fraction of the speed of light is this? Draw a sketch to illustrate your ideas and support your calculationarrow_forwardO O o O O 2. 2536?module_item_id3D3790194 1 dozen = 12 things 1 day 24 hours 1 mile 5280 feet 1 meter 100 centimeters 1 year 365 days 1 six-pack = 6 cans 1 hour = 60 minutes 12 inches = 1 foot 1000 meters = 1 kilometer 1 case 24 cans 1 minute = 60 seconds 1 inch = 2.54 centimeters %3D 1 cup 8 ounces 1 box of Bisquick contains 96 ounces of pancake mix %3D 1. Billy has trouble with math, and his answer is "10" to the following question, "How 120 dozen?" a. What is the correct answer? b. What advice can you give Billy to help him do the calculation correctly? If I want 72 cans of soda, how many six-packs should I buy? 3. How many cases of soda should be bought if 8 dozen soda cans are wanted? 4. One million seconds are how many days? vork (hand-written, typed, or drawn on paper or on a computer).arrow_forward
- The speed of light in space is 3.00 x 108 m/s. The time for light from the Sun to reach Earth is 8 minutes 20 seconds. Therefore, the distance from the Sun to Earth is 2.40 x 109 m. 8.64 x 1012 m. 1.50 x 1011 m. 2.25 x 109 m.arrow_forwardA light-year is the distance that light can travel in one year. Similarly, we can define a light-second, light-day, etc. as the distance that light can travel in other time intervals. Calculate the distance represented by each of the following: (Assume that the speed of light is 3 x 10^8m/s) 5 light-minutes 6 light-days 6 light-days, but this time answer in miles (enter just the number with no units)arrow_forwardA searchlight is directed to a plane flying directly above the light at an altitude of 3km and at a speed of 300km per hour. how fast is the light turning 3 seconds after the plane flies directly overhead?arrow_forward
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