21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 1.1, Problem 1.1CYU
To determine
The rank in the order of smallest to largest.
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11 Which of these statements is false?
A
B
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D
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A light-year is a unit of time
We cannot see father than 14 billion light years away
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Another name for universe is cosmos
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16.
What is the wavelength of a light wave with a frequency of 16 GHz?
Speed of light is 300,000,000 m/s
1 GHz = 1x109 Hz or 1,000,000,000 Hz
53.3 m
18,750,000 m
0.02 m
0.3 m
1Which of the following best describes a frame of reference?
an experiment that proved that Earth did not have an aether wind
the theory that describes the behavior and characteristics of objects moving at relativistic speeds
the effect of the slowing of time as an object moves with high speeds
a point in which someone relates the behavior of an object from one perspective
2If an electron moves from n = 5 to n = 1, what wavelength of light is emitted? (h = 6.626 x 10-34, 1 eV = 1.6 x 10-19 J)
4008 nm
434 nm
95 nm
1281 nm
3Which of the following best describes a frame of reference?
an experiment that proved that Earth did not have an aether wind
the theory that describes the behavior and characteristics of objects moving at relativistic speeds
the effect of the slowing of time as an object moves with high speeds
a point in which someone relates the behavior of an object from…
Chapter 1 Solutions
21st Century Astronomy
Ch. 1.1 - Prob. 1.1CYUCh. 1.2 - Prob. 1.2CYUCh. 1.3 - Prob. 1.3CYUCh. 1 - Prob. 1QPCh. 1 - Prob. 2QPCh. 1 - Prob. 3QPCh. 1 - Prob. 4QPCh. 1 - Prob. 5QPCh. 1 - Prob. 6QPCh. 1 - Prob. 7QP
Ch. 1 - Prob. 8QPCh. 1 - Prob. 9QPCh. 1 - Prob. 10QPCh. 1 - Prob. 11QPCh. 1 - Prob. 12QPCh. 1 - Prob. 13QPCh. 1 - Prob. 14QPCh. 1 - Prob. 15QPCh. 1 - Prob. 16QPCh. 1 - Prob. 17QPCh. 1 - Prob. 18QPCh. 1 - Prob. 19QPCh. 1 - Prob. 20QPCh. 1 - Prob. 21QPCh. 1 - Prob. 22QPCh. 1 - Prob. 23QPCh. 1 - Prob. 24QPCh. 1 - Prob. 25QPCh. 1 - Prob. 26QPCh. 1 - Prob. 27QPCh. 1 - Prob. 28QPCh. 1 - Prob. 29QPCh. 1 - Prob. 30QPCh. 1 - Prob. 31QPCh. 1 - Prob. 32QPCh. 1 - Prob. 33QPCh. 1 - Prob. 34QPCh. 1 - Prob. 35QPCh. 1 - Prob. 36QPCh. 1 - Prob. 37QPCh. 1 - Prob. 38QPCh. 1 - Prob. 39QPCh. 1 - Prob. 40QPCh. 1 - Prob. 41QPCh. 1 - Prob. 42QPCh. 1 - Prob. 43QPCh. 1 - Prob. 44QPCh. 1 - Prob. 45QP
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- 3. How bright would the sun be (in magnitude) if it was located 3.26 light years away from Earth? If the sun was this far, how much dimmer would it be?arrow_forwardA galaxy whose spiral arms have a woolly or fluffy appearance are called a. flocculent. b. hairy. c. vague. d. foggy. e. fleecy.arrow_forward5. We observe an increase in brightness of a star that is 5.81×10¹⁹ m away. How long ago did the actual increase in brightness take place, in years? Find the time that is required for light to reach the Earth.arrow_forward
- QUESTION 3 Use the fact that the speed of light in a vacuum is about 3.00 x 108 m/s to determine how many kilometers (km) a pulse from a laser beam travels in 2.2 hours. Answer in units of km and round to two decimal places. Tip: Scientific/exponential notation such as $.4×10 -4 should be entered as 5.4e-4 or 5.4E-4 with NO space.arrow_forwardExplain why a light-year is a unit of time and distancearrow_forward34. What are the dimensions of mass (M), length (L) and time (T) if we take the velocity of light, the universal gravitational constant and the curve constant as the basic constellations and take the dimensions of those constellations as C, G. and h respectively?arrow_forward
- If our universe is expanding, what are the implications for the separation between two stars within our galaxy? A. The two stars are moving farther apart. B. The two stars are moving closer together. C. The distance between the two stars is unaffected. D. The question is impossible to answer without more information.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 × 108 m/s). 1. 4 light-seconds 2. 3 light-minutes 3. 2 light-days 4. 2 light-days, but this time answer in miles (enter just the number with no units)arrow_forwardA star that is moving toward Earth will a. have its spectral lines shifted to the red. b. have its spectral lines shifted to the blue. c. appear hotter than it actually is. d. appear cooler than it actually is. e. appear dimmer than it actually is.arrow_forward
- Because of the precession of the Earth’s axis, a. there are four seasons, spring, summer, fall, and winter. b. the Earth receives more solar radiation in the summer than in the winter. c. Polaris will not be the North Star in about 12,000 years. d. the lengths of the Earth’s days and nights vary throughout the year.arrow_forwardFifteen years ago, a quasar was observed that was found to be located 12 billion light years away. If our universe is approximately 15 billion years old, when did the quasar emit the light that we observe? O A. 3 billion years ago O B. 12 billion years ago O C. 15 billion years ago OD. 15 years agoarrow_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 108 m/s)A. 4 light-seconds.B. [3pt] 4 light-minutes.C. 4 light-days.D. 4 light-days, but this time answer in miles (enter just the number with no units)arrow_forward
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