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What is the half-life of a radioactive isotope?

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Question: What is the half-life of a radioactive isotope?

Options:

  1. Time taken for half of the sample to decay
  2. Time taken for the entire sample to decay
  3. Time taken for the sample to double
  4. None of the above

Correct Answer: Time taken for half of the sample to decay

Solution: 

The half-life is defined as the time taken for half of the radioactive sample to decay.

What is the half-life of a radioactive isotope?

Practice Questions

Q1
What is the half-life of a radioactive isotope?
  1. Time taken for half of the sample to decay
  2. Time taken for the entire sample to decay
  3. Time taken for the sample to double
  4. None of the above

Questions & Step-by-Step Solutions

What is the half-life of a radioactive isotope?
  • Step 1: Understand that a radioactive isotope is an unstable atom that can decay over time.
  • Step 2: Know that decay means the isotope transforms into a different element or a different isotope.
  • Step 3: The half-life is the specific time it takes for half of a given amount of the radioactive isotope to decay.
  • Step 4: For example, if you start with 100 grams of a radioactive isotope, after one half-life, you will have 50 grams left.
  • Step 5: After another half-life, you will have 25 grams left, and this process continues.
  • Step 6: The half-life is a constant value for each radioactive isotope, meaning it does not change regardless of the amount you start with.
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