The emission of alpha decay from a radioactive substance causes:
Correct answer: D. Decreases in 'A' by 4 and decreases in 'Z' by 2
- A. Decreases in 'Z' by 4 and decreases in 'A' by 2
- B. Decreases in 'A' by 1 and 'Z' remains same
- C. Decreases in 'Z' by 1 and 'A' remains same
- D. Decreases in 'A' by 4 and decreases in 'Z' by 2
Explanation
The 'A' (atomic mass) of an alpha particle is 4 and the 'Z' (atomic number) is 2. Hence A and Z would decrease by 4 and 2 respectively by emission of an alpha-particle.
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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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