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What is the half-life of a radioactive substance?

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

Options:

  1. The time taken for half of the substance to decay
  2. The time taken for the entire substance to decay
  3. The time taken for the substance to double
  4. The time taken for the substance to reach equilibrium

Correct Answer: The time taken for half of the substance to decay

Solution: 

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

What is the half-life of a radioactive substance?

Practice Questions

Q1
What is the half-life of a radioactive substance?
  1. The time taken for half of the substance to decay
  2. The time taken for the entire substance to decay
  3. The time taken for the substance to double
  4. The time taken for the substance to reach equilibrium

Questions & Step-by-Step Solutions

What is the half-life of a radioactive substance?
Correct Answer: Half-life is the time taken for half of a radioactive substance to decay.
  • Step 1: Understand that a radioactive substance is one that can decay over time.
  • Step 2: Know that decay means the substance breaks down into something else.
  • Step 3: The half-life is a specific time period.
  • Step 4: During this time, half of the original amount of the substance will have decayed.
  • Step 5: For example, if you start with 100 grams of a substance, after one half-life, you will have 50 grams left.
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