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Half-Life (Grade 10)

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Instructions: Answering the following questions requires the use of a reference table that lists the half-lives of different radioisotopes.

Which of the following nuclides has a half-life greater than 28 years?
  1. Cs-137
  2. K-42
  3. N-16
  4. Ne-19
Which of the following nuclides has a half-life less than 10 seconds?
  1. Fr-220
  2. N-16
  3. C-14
  4. Au-198
Which radioisotope has a half-life between 5 and 6 years?
  1. C-14
  2. Ca-37
  3. I-131
  4. Co-60
Which of the following radioisotopes has half-life greater than 10 years and has a decay mode of beta?
  1. I-131
  2. N-16
  3. Kr-85
  4. P-32
What is the total number of years that passes before only 6.25 grams of an original 25-gram sample of C-14 remains unchanged?
  1. 5715 years
  2. 11430 years
  3. 17145 years
  4. 2857.5 years
What is the half-life of a radioisotope if 50.0 grams of an original 200.-gram sample of the isotope remains unchanged 15.60 years?
  1. 7.80 years
  2. 15.60 years
  3. 23.40 years
  4. 3.90 years
What is the amount of an original 300.0-g sample of K-37 that remains unchanged after 8.61 seconds?
  1. 18.75 g
  2. 4.6875 g
  3. 2.34375 g
  4. 37.5 g
How many years have passed if 25 grams of an original 100.0-gram sample of Sr-90 remains unchanged?
  1. 58.2 years
  2. 87.3 years
  3. 29.1 years
  4. 116.4 years
Polonium-210 has a half-life of 138 days. Determine the total mass of an original 300-gram sample of Po-210 that remains unchanged after 690 days.

The half-life can be defined as the amount of time that must pass before half of the original mass of a specific radioisotope remains.
  1. True
  2. False
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