There are initially 400 atoms in a radioactive sample. What would be the number of atoms after 3 half - life?
Correct answer: C. 50
- A. 400
- B. 200
- C. 50
- D. 25
Explanation
After each half-life the number of radioactive sample becomes half. First Half Life: 400->200 Second Half life: 200->100 Third Half life: 100->50.
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Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
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