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JAMB Physics 1985 Question 49

Question 49

Radioactivity and Nuclear Physics

Which of the following features is NOT a characteristic of natural radioactivity?

  1. A.Radioactivity is a nuclear phenomenon
  2. B.Radioactivity is exhibited only by elements of mass number greater than 206
  3. C.The radioactivity of an element is affected by electric and magnetic fields in the surroundings.
  4. D.Radioactive substances emit three types of radiations, α-rays, β-rays and γ-rays
  5. E.The radioactive element is transformed into a new element.
Show the answer and explanation

Answer: C (The radioactivity of an element is affected by electric and magnetic fields in the surroundings.)

Explanation

Radioactive decay happens inside the nucleus and is not affected by outside conditions such as electric and magnetic fields, temperature or pressure.