QB - An alien visited our planet in year 5305 and found that humans have long gone from this planet after nuclear war. He found that humanity has destroyed itself in a nuclear war. He analysed a certain chunk of concrete and found 2.5g of 226RA and 6.8g of 206Pb. What was the year of the nuclear war? Hint: 226Ra decays to 206Pb in a number of steps with a combined half-life of 1640 years. ------

QB - An alien visited our planet in year 5305 and found that humans have long gone from this planet after nuclear war. He found that humanity has destroyed itself in a nuclear war. He analysed a certain chunk of concrete and found 2.5g of 226RA and 6.8g of 206Pb. What was the year of the nuclear war? Hint: 226Ra decays to 206Pb in a number of steps with a combined half-life of 1640 years. ------

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

MISSED THIS? Read Section 17.5. You can click on the Review link to access the section in your eText. Part A A patient is given 0.050 mg of technetium-99 m (where m means metastable-an unstable but long-lived state), a radioactive isotope with a half-life of about 6.0 hours. How long until the radioactive isotope decays to 1.3x10-2 mg ? Express your answer using two significant figures. ΑΣφ. ? hours Submit Request Answer
A rock contains 0.697 mg of 206pb for every 1.000 mg of 238 U present. Assuming that no lead was originally present, that all the 206pb formed over the years has remained in the rock, and that the t1/2 number of nuclides in intermediate stages of decay between 238U and 206pb is negligible, calculate the age of the rock. (For 238U, 4.5x10⁹ years.) yr =
||| Understanding radioactive half life sample A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 19.00 umol of the radionuclide. First, order the samples by decreasing initial radioactivity. Then calculate how long it will take for the amount of radionuclide in each sample to decrease to 1/4 of the initial amount. A B C D Explanation symbol 33 15 188 75 127 54 227 89 radionuclide P Re Xe Ac Check half-life 25. days 17. hours 36. days 22. years initial radioactivity (choose one) B (choose one) (choose one) O (choose one) e time for amount of radionuclide to decrease to 1/4 of initial amount X days hours days years S MacBook Pro 0/3 Kimberly V ( Ⓒ2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility ?圖□ 圆图 olo Ar
34 part d only 40 part B only
Ruthenium-106 (106Ru) is used to treat melanoma in the eye. This isotope decays by β– emission with a half-life of 373.59 days. One source of the isotope is reprocessed nuclear reactor fuel. How many protons and neutrons does the 106Ru nucleus contain? Identify the missing daughter nucleus in the β– emission decay of 106Ru below. How many years after 106Ru is implanted in the eye does it take for its decay rate (or activity) to be reduced to 27.5% of the initial decay rate? Use 1 year = 365 days.
An unknown radioactive substance is currently decaying. Initially, the sample contained 17.8g of the substance. After 5.00 hours of decay, 3.4g of the substance remain. What is the half-life (t1/2) of the substance?
Polonium-218 is an alpha emitter with a half-life of 3.0 minutes.If a sample contains 55 mg of Po-218 (atomic mass =218.008965 amu), how many alpha emissions occur in25.0 minutes? If the polonium is ingested by a person, to whatamount of radiation (in Ci) is the person exposed?
Please send me the question in 20 minutes it's very urgent plz
The following isotopes are all stable : 20Ne, Ne, 22Ne 10+ 10- While the following is not, so what be its decay likely? 23 Ne 10- Alpha Positron Electron capture Beta
A rock contains 0.617 mg of 206Pb for every 1.000 mg of 238U present. Assuming that no lead was originally present, that all the 206Pb formed over the years has remained in the rock, and that the number of nuclides in intermediate stages of decay between 238U and 206 Pb is negligible, calculate the age of the rock. (For 238U, t1/2 = 4.5 X 109 years.)
Bi−210 is a beta emitter with a half-life of 5.0 days If a sample contains 1.0 g of Bi−210, how many beta emissions would occur in 5.0 days?