Half-life: Calculating Radioactive Decay and Interpreting Decay Graphs


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If a substance has a half-life of 5 years, then how much of the initial sample remains after 15 years?

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1. Carbon-10 has a half-life of about 19 seconds. How many half-lives does it undergo in 2 minutes and 32 seconds?

2. A 6.95 gram sample of radioactive nobelium-259 has a half-life of 58 min. How much is left after 2 hours and 54 minutes?

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About This Quiz & Worksheet

Test your understanding of the rate of decay by looking through these materials. If you've ever wondered how radioactive materials decay and what that entails, you can check out this quiz and worksheet to better understand this important process.

Quiz & Worksheet Goals

Use these materials to study:

  • Graphs representing radioactive decay
  • The definition of half-life
  • How half-life works with various elements
  • Tools to solve problems involving radioactive decay

Skills Practiced

These materials will give you an opportunity to practice the following skills:

  • Problem solving - use acquired knowledge to solve half-life practice problems
  • Interpreting information - verify that you can read information regarding radioactive decay and interpret it correctly
  • Information recall - access the knowledge you've gained regarding decay graphs

Additional Learning

To study more, you can check out the accompanying lesson titled Half-life: Calculating Radioactive Decay and Interpreting Decay Graphs. That lesson will cover the following objectives:

  • Explain the definition of half-life
  • Provide examples that explain rate of decay
  • Describe radioactive decay using several elements
  • Provide tools that show how elements decay over time
  • Review the process of carbon dating