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JAMB Physics 2014 Question 48

Question 48

Radioactivity and Nuclear Physics

When 21082Pb decays to 20680Pb, it emits

  1. A.an apha particle.
  2. B.one beta particle.
  3. C.one alpha and one beta particle.
  4. D.two alpha and two beta particles.
Show the answer and explanation

Answer: A (an apha particle.)

Explanation

The mass number falls by 4 and the atomic number by 2, which is exactly one alpha particle.