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.
Last updated
About Nuclear Physics
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.
Practise Nuclear Physics
1,254 free Nuclear Physics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.