Alpha rays emitted from a radioactive substance are
Correct answer: B. helium nuclei
- A. negatively charged particles
- B. helium nuclei
- C. hydrogen nuclei
- D. Deutrons
Explanation
B is the right option because Alpha rays emitted from a radioactive substance consist of helium nuclei, each composed of two protons and two neutrons. These particles have a positive 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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