21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 1, Problem 26QP
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What does the difference in the distance between Andromeda galaxy and Earth from 1945 to now tell about a scientific “fact” and how our knowledge evolves.
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1Which of the following best describes a frame of reference?
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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
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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…
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
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)
The moon is 1.3 light-seconds away. Imagine you are standing at the Canadian Space Agency headquarters in St. Hubert, Quebec and you bounce a 755 MHz radio signal off the moon (the moon acts like a mirror, reflecting the signal, such that it comes back to you). How long will it take for that radio signal to get back to you on earth? Answer in seconds with one decimal place.
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
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- Please recheck and answer no. 3 thoroughly with complete solutions and illustrations. Thank you! If you can answer no. 2 that's also fine thank you!arrow_forwardWhen asked about his thoughts on a new scientific hypothesis, Wolfgang Pauli once said: “That's not right, that's not even wrong.” What fundamental principle of science was he alluding to? And why is the second part of this quote more important than the first?arrow_forwardThe speed of light is 200 million meters per second. One kilometer is 1000 meters. What is the speed of light in miles per hour? Round your answer to the nearest million miles.arrow_forward
- Complete answers please!arrow_forwardHow did they get 0 and then 1250nm for the answers? Trying to study for a quiz can you guys help pleasearrow_forwardThinking about the topics in this chapter, here is an Earth analogy. In big cities, you can see much farther on days without smog. Why?arrow_forward
- The meter was redefined as a reference to Earth, then to krypton, and finally to the speed of light. Why do you think the reference point for a meter continued to change?arrow_forwardPlease complete full question. The answer is of no use without it.arrow_forwardThe Planck time is the unique interval of time that can be built out of G, c, and h. Some physicists think that time intervals shorter than the Planck time have no meaning. Using G = 6.7 x 10-11 kg-1 m3 s-2, c = 3 x 108 m s-1, and h = 6.6 x 10-34 kg m2 s-1, calculate the Planck time, in units of 10-43 s.arrow_forward
- The intensity of light from a central source varies inversely as the square of the distance. If you lived on a planet only half as far from the Sun as our Earth, how would Sun’s light intensity compare with that on Earth? How about a planet 10 times farther away than Earth?arrow_forwardThe Big Bang Theory is currently the most widely-accepted explanation for the origin of the Universe. As technology has emerged, new data has been collected to allow for a clearer understanding of how the Universe is changing and the possible things that might happen to it in the future. Which of the following is not a question that can be answered using scientific processes? >What was the cause of the Big Bang? >What is the type of energy emitted by celestial objects?>What is the rate at which the universe appears to be expanding? >What are the chemical elements that exist in the other parts of the galaxy?arrow_forwardUse the equation E = mc^2 where E is energy in Joules (J), m is mass in kilograms (kg) and c is the speed of light 3 x 10^8 m/s to answer the following: a) One ton of TNT releases 4.18 gigajoules of energy. The metric prefix giga means billion. a) How much mass would be required to release an equivalent amount of energy? b) How much energy (J) is equivalent to 1 kilogram of mass?arrow_forward
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