21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 22, Problem 43QP
To determine
The limitations that can be observed on proton decay and on the GUT.
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A certain radioactive material has a half-life of 8 minutes. Suppose you have a large sample of this material , containing 10^25 atoms. 5x10^24 atoms decay in the first 8 minutes and 2.5x10^24 atoms decay in the second 8 minutes. What is the ratio of the number of atoms that decay in the first 8 minutes to the number of atoms that decay in the second 8 minutes
A 5/1
B 2/1
C 1/5
D 1/2
An isotope of a radioactive element has half-life equal to 9 thousand years.
Imagine a sample that is so old that most of its radioactive atoms have decayed, leaving just 25 percent of the initial quantity of the isotope remaining.
How old is the sample?
Give your answer in thousands of years, correct to one decimal place.
Carbon-14 is radioactive while Carbon-12 is stable. In your body, the ratio of C-14 to C-12 is for every 10,000 C-14 atoms, there are 1 trillion (1,000,000,000,000) C-12 atoms. This is the normal ratio for livings things. In a piece of a sabre-tooth tiger bone, a scientist finds there are only 625 C-14 atoms for every 1 trillion C-12 atoms.How old is the sabre-tooth tiger bone? The half-life for Carbon-14 is 5730 years.
Chapter 22 Solutions
21st Century Astronomy
Ch. 22.1 - Prob. 22.1CYUCh. 22.2 - Prob. 22.2CYUCh. 22.3 - Prob. 22.3CYUCh. 22.4 - Prob. 22.4CYUCh. 22.5 - Prob. 22.5CYUCh. 22 - Prob. 1QPCh. 22 - Prob. 2QPCh. 22 - Prob. 3QPCh. 22 - Prob. 4QPCh. 22 - Prob. 5QP
Ch. 22 - Prob. 6QPCh. 22 - Prob. 7QPCh. 22 - Prob. 8QPCh. 22 - Prob. 9QPCh. 22 - Prob. 10QPCh. 22 - Prob. 11QPCh. 22 - Prob. 12QPCh. 22 - Prob. 13QPCh. 22 - Prob. 14QPCh. 22 - Prob. 15QPCh. 22 - Prob. 16QPCh. 22 - Prob. 17QPCh. 22 - Prob. 18QPCh. 22 - Prob. 19QPCh. 22 - Prob. 20QPCh. 22 - Prob. 21QPCh. 22 - Prob. 22QPCh. 22 - Prob. 24QPCh. 22 - Prob. 28QPCh. 22 - Prob. 29QPCh. 22 - Prob. 31QPCh. 22 - Prob. 32QPCh. 22 - Prob. 33QPCh. 22 - Prob. 34QPCh. 22 - Prob. 35QPCh. 22 - Prob. 36QPCh. 22 - Prob. 37QPCh. 22 - Prob. 38QPCh. 22 - Prob. 39QPCh. 22 - Prob. 40QPCh. 22 - Prob. 41QPCh. 22 - Prob. 42QPCh. 22 - Prob. 43QPCh. 22 - Prob. 44QPCh. 22 - Prob. 45QP
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- Which particle has the largest mass? and How do nuclear decay reactions help explain the difference in the mass of the proton and neutron?arrow_forwardUranium, an important component of both nuclear weapons and nuclear reactors, has two major isotopes—U-238, which has a half-life of approximately 4.5 billion years, and U-235, which has a half-life of approximately 700 million years. Both were present in equal amounts at the time of the creation of the Earth, 4.5 billion years ago. How many billion years after the creation of the Earth had the amount of radiation from uranium decayed to half the amount present at the time of the creation of the Earth? (Round your answer to the nearest hundredth of a billion years.)arrow_forwardAn isotope of a radioactive element has half-life equal to 5 thousand years. Imagine a sample that is so old that most of its radioactive atoms have decayed, leaving just 20 percent of the initial quantity of the isotope remaining. How old is the sample? Give your answer in thousands of years, correct to one decimal place. Age : ___ thousand years.arrow_forward
- You have just isolated a new radioactive element. If you can determine its half-life, you will win the Nobel Prize in physics. You purify a sample of 2 grams. One of your colleagues steals half of it, and four days later you find that 0.4 gram of the radioactive material is still left. What is the half-life? (Round your answer to three significant digits.)arrow_forwardhello, how we solve this problem?arrow_forwardThe half-life of uranium-234 is approximately 25,000 years. How many undecayed nuclei remain after 100,000 years? Calculate the decay rate for uranium-234. If a sample contains 2.7 billion atoms of uranium-234 what is the rate of decay for that sample?arrow_forward
- K. Consider the following nuclear decay equation; the half-life of Carbon 14 is 5730 years. What is name given to the particle represented by How many neutrons does this isotope of Carbon have?arrow_forwardHow much time is the green dot after div 4? Answer in milliseconds (this and all time questions in this quiz). The scale is 2 ms/divarrow_forwardCarbon-14 has a half-life of 5730 years. What mass of carbon-14 would have a decay rate of 20,000 Bq? Considering that carbon-14 decays via beta-minus radiation, ALSO write the complete nuclear decay equation.arrow_forward
- Multiply the following BINARY NUMBERS 10101.1111 X 101.11 (Note: The problem should be solved in separate paper with steps and scanned copy should be submitted along with other answers The final answer must also be entered in the boxes below. Enter only one bit in a box and fill the unused boxes if any, with zeros) Answer - Integer part = Answer - Fractional part=arrow_forwardHow much energy does 1 nuclear reaction which converts 4 protons to a Helium nucleus generate? In order to maintain thermal equilibrium, how many such nuclear reactions have to occur every second? What is hydrostatic equilibrium?arrow_forwardThe half-life of a certain radioactive material is 32 days. An initial amount of the material has a mass of 361 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 5 days. Round your answer to the nearest thousandth.arrow_forward
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