In radioactive decay, after each half-life, the remaining mass becomes half of the previous. After three half-lives: 1st half-life: 160 → 80 2nd half-life: 80 → 40 3rd half-life: 40 → 20 So, 20 micrograms of polonium-218 will remain.
The sample of polonium - 218 has original mass of 160 micrograms. How much of this sample will be left after three half lives?
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Question context
This question is part of ⚙️ Mechanical Eng within the broader 🛠️ Engineering Essentials subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.