Which one of the following particles has the highest mass?
Correct answer: D. Alpha
- A. Gamma
- B. Beta positive
- C. Beta negative
- D. Alpha
Explanation
Composition-wise, an alpha particle is a helium nucleus that has an atomic mass of 4 AMU. A beta (negative or positive) particle, on the other hand, is the same as an electron and has a mass of 0.0005 AMU. Gamma rays have no mass or charge.
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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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