What fraction of undecayed radium atoms would remain after two half-lives?
A. 1/16 |
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B. 1/4 |
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C. 1/8 |
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D. 0 |
What fraction of undecayed radium atoms would remain after two half-lives? A. 1/16 B. 1/4 C....
A) According to the data, what are the approximate half-lives of the hypothetical elements A, B, C, and D? B) Which of the hypothetical substances would be the most harmful to living organisms? Why? C) What part of an original isotope's number of atoms remains after two half-lives? D) After three half-lives of an isotope, 1 billion (one-eighth) of the original isotope's atoms still remain in a certain amount of this element. How many atoms of the daughter product would...
16. What will he the level of activity (in terms of X) after two half lives have elapsed? 17. What would the activity of a the above sample be if we tripled its size? 18. If the initial activity of 0.365 grams of the above sample is Y Bq, what would the activity be if we increased the initial sample to 0.950 grams? The decay curve of a radioactive nuclide 1000 sample is shown. Its initial activity is measured to...
Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute?
What is the % of parent atoms in a rock after three half-lives?
after three half lives of sn isotope , 1 billion of the original isotopes Adams still remain in a certain amount of this element how many atoms of the daughter product would you expect to be present
What fraction of a sample of 6832Ge, whose half-life is about 9 months, will remain after 2.1 yr ?
13) Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute? (6 points)
the half-life of Sr-90 is 29 years. what fraction if the atoms in a sample Sr-90 would remain 175 years later?
13) Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute? (6 points) 14) Photons of energy 6.0 J are incident on a metal. It is found that current flows until a stopping potential of 3.8 V is applied. A) Find the work function. (5 points) B) If the wavelength of incident photons is tripled, what is the maximum kinetic energy of ejected electrons? (5 points)
Question 4 a) A radioactive substance has a half-life of 30 minutes. What fraction of the atoms will not have decayed after 1 hour? Use the graphical method (sketch nuclei remaining – time graph) to answer this question. b) A 0.25-kg radon-226 emits alpha particles at a measured rate of 9.0 × 10^12 s^-1. What is the decay constant of radium? (No of Ra atoms in a mole = 6.0 × 10^23)