General Science • PhysicsMedium
What is the name of the radioactive decay process in which an unstable atomic nucleus emits a helium-4 nucleus?
A. Beta decay
B. Gamma emission
C. Alpha decay✓ Correct Answer
D. Electron capture
💡 Solution & Explanation
Alpha decay occurs when an unstable nucleus ejects an alpha particle, which consists of two protons and two neutrons identical to a helium-4 nucleus, decreasing the mass number by four. Unlike beta decay involving electrons or positrons, alpha emission significantly reduces nuclear mass. Henri Becquerel discovered natural radioactivity while studying uranium salts.
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