When a radioactive nucleus emits an alpha particle, its atomic mass drops by
Correct answer: C. 4 atomic mass units (u)
- A. 1 atomic mass unit (u)
- B. 2 atomic mass units (u)
- C. 4 atomic mass units (u)
- D. 8 atomic mass units (u)
Explanation
The correct answer is Option C: 4 atomic mass units (u). When a radioactive nucleus emits an alpha particle, it loses two protons and two neutrons, resulting in a decrease of 4 atomic mass units. Options A and B underestimate the change, while Option D overestimates it. The correct calculation accounts for the total mass of the two protons and two neutrons in the alpha particle.
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About Radioactive Decay
Radioactive decay is the spontaneous transformation of unstable nuclei, described by decay constant, activity, half life and the exponential decay law. Work includes alpha, beta and gamma emissions, decay equations and remaining nuclei, with half life distinguished from the time required for complete decay.
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