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Set NC4: Half Life and Radioactive Decay

Problem
Points
0/2
0/3
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0/5
Total Score
0/16
Percentage
0 %
Assignment Overview

Relate the amount of an original sample of a radioisotope that remains after a specified amount of time if given the half-life of the radioisotope. 

 1. Problem NC4Q1
Points: 0/2

A radioisotope has a half-life of 12.4 minutes. 

  1. How much time would elapse before a sample of the radioisotope contains 50% of its original amount?

    time

    minutes

  2. How much time would elapse before a sample of the radioisotope contains 25% of its original amount?

    time

    minutes

 2. Problem NC4Q2
Points: 0/3

A radioisotope has a half-life of 2.16 days. 

  1. How much time would elapse before a sample of the radioisotope contains 50% of its original amount?

    Time

    days

  2. How much time would elapse before a sample of the radioisotope contains 25% of its original amount?

    Time

    days

  3. How much time would elapse before a sample of the radioisotope contains 12.5% of its original amount?

    Time

    days

 3. Problem NC4Q3
Points: 0/2

A radioisotope has a half-life of 1.34 years. 

  1. What percentage of the original sample of this radioisotope would be present after 1.34 years?

    Percentage Remaining

    %

  2. What percentage of the original sample of this radioisotope would be present after 2.68 years?

    Percentage Remaining

    %

 4. Problem NC4Q4
Points: 0/2

A radioisotope has a half-life of 4.20 days.

  1. What percentage of the original sample of this radioisotope would be remaining after 16.80 days?

    Percent Remaining

    %

  2. How many half-lives is this 16.80 days equivalent to?

    # of Half-Lives

 5. Problem NC4Q5
Points: 0/2

A radioisotope has a half-life of 6.50 minutes. 

  1. What percentage of the original sample of this radioisotope would be remaining after 39.00 minutes? Enter your answer with at least 3 decimal places.

    Percentage Remaining

    %

  2. How many half-lives is this 39.00 minutes equivalent to?

    # of Half-Lives

 6. Problem NC4Q6
Points: 0/5

A radioisotope has a half-life of 12.5 minutes. A 1000.0-gram sample of the isotope is available at t = 0 minutes. Determine the amount that is remaining at the times specified in the table at the right.

  1. Row 2:

    g

  2. Row 3:

    g

  3. Row 4:

    g

  4. Row 5:

    g

  5. Row 6:

    g


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