Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Question
Chapter 25, Problem 2SOP
To determine
The length of the line that is used to represent the history of human civilization.
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Students have asked these similar questions
one hundred milli- (100 times one one-thousandth):
102 ✕ 10−3 = 10(2 + [−3]) = 10(2 − 3) = 10−1 = 0.1 (100 ÷ 1,000 = 0.1)
one hundred micro- (100 times one one-millionth):
102 ✕ 10−6 = 10(2 + [−6]) = 10(2 − 6) = 10−4
How do we write one hundred nano- (100 times one-billionth)?
102 ✕ 10−9 = 10
We write ten micrometers as follows.
10 ✕ 10−6 m = 10−5 m
How do we write ten nanoseconds?
10 ✕ 10−9 s = 10 s
Hey sense of proportion the earth is 4.6 billion years old but human civilization the building of cities begin only about 10,000 years ago. If you represent history of earth with a line one mile long (63,360) how long must the line be to represent the history of human civilization?
1 million kilometers can be expressed in scientific notation as:
10x10^6 km
10x10^-6 km
none of these
1x10^6 km
1x10^-6km
Chapter 25 Solutions
Foundations of Astronomy (MindTap Course List)
Ch. 25 - Explain how astrobiology is a science and not a...Ch. 25 - Describe one special quality of water that makes...Ch. 25 - Mars and Europa are two Solar System bodies that...Ch. 25 - How does the DNA molecule produce a copy of...Ch. 25 - What would happen to a life-form if the genetic...Ch. 25 - What would happen to a life-form if the genetic...Ch. 25 - What would happen to a life-form if the...Ch. 25 - Describe an example of natural selection acting on...Ch. 25 - Prob. 9RQCh. 25 - What evidence do scientists have that life on...
Ch. 25 - Define organic, as in organic molecule. How is...Ch. 25 - Why is liquid water generally considered necessary...Ch. 25 - Some meteorites contain organic molecules. What...Ch. 25 - What is the difference between chemical evolution...Ch. 25 - Prob. 15RQCh. 25 - Why was Earths early atmosphere able to support...Ch. 25 - Molecules of which gas were needed in Earths...Ch. 25 - Does intelligence make a creature more likely to...Ch. 25 - Describe one hypothesis for how cells first...Ch. 25 - What is the evidence that the first organisms on...Ch. 25 - Name three locations in our Solar System to search...Ch. 25 - Why are upper-main-sequence (high-luminosity) host...Ch. 25 - Prob. 23RQCh. 25 - How does the stability of technological...Ch. 25 - Prob. 25RQCh. 25 - Prob. 26RQCh. 25 - Why are scientists confident Earth has never been...Ch. 25 - Why does the Drake equation implicitly assume the...Ch. 25 - A single human cell encloses about 1.5 m of DNA....Ch. 25 - If you represent Earths history by a line that is...Ch. 25 - Consider Figure 25-8. What is the ratio of the...Ch. 25 - Suppose a human generation is defined as the...Ch. 25 - If a star must remain on the main sequence for at...Ch. 25 - Prob. 6PCh. 25 - If you detected radio signals with an average...Ch. 25 - Prob. 8PCh. 25 - The first radio broadcast was made on January 13,...Ch. 25 - Prob. 10PCh. 25 - The DNA in a single cell in your body contains...Ch. 25 - Prob. 2SOPCh. 25 - Look at Figure 25-11. Since the time we sent the...Ch. 25 - The star cluster shown in this image contains a...Ch. 25 - If you could search for life in the galaxy shown...
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- If you represent Earths history by a line that is 1 m long, how long a segment would represent the 400 million years since life first moved onto the land? How long a segment would represent the 4-millionyear history of humanoid life?arrow_forwardWhy is there so little evidence of Earth’s earliest history and therefore the period when life first began on our planet?arrow_forwardOne of the fossilized remains of the Taong Tabon you found contains 153 grams of Carbon-14 at time t = 0. If the half-life of Carbon-14 is 5 730 years, how much Carbon-14 remains after 500 years?arrow_forward
- The half-life of carbon-14 is 5,730 years. Suppose a fossil is found with 30 percent as much of its carbon -14 as compared to a living sample. How old is the fossil?arrow_forwardA radioactive isotope has a half-life of 1.2 billion years. As measured by the presence of the isotope and its stable decay product, a rock originally contained 10 grams of the radioactive isotope, and now contains 1.25 grams. Approximately how many years old is the rock?arrow_forwardSource A has a half-life of 10 million years, and source B has a half-life of 5 million years. After 10 million years, what percent of each source remains? A. 50% of source A and 25% of source B B. 50% of source A and 0% of source B C. 25% of source A and 25% of source B D. 25% of source A and 0% of source Barrow_forward
- (a) Astronomers use a special unit to measure distances called astronomical unit (AU) where 1 AU is defined as 92,955,807 miles. They also use another unit called parsecs where 1 parsec is equal to 206,264.4 AU. Convert 1 Zm (zettametre) into kiloparsecs. (Given 1 mi = 1.609 km; 1 km = 1000 m).arrow_forwardA radio broadcast left Earth in 1911. How far in light years has it traveled? If there is, on average, 1 star system per 400 cubic light years, how many star systems has this broadcast reached? Assume that the fraction of these star systems that have planets is 0.50 and that, in a given planetary system, the average number of planets that have orbited in the habitable zone for 4 billion years is 0.20. How many possible planets with life could have heard this signal?arrow_forward
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