WAEC Physics 2014 Objective — Question 50
Question 50 of 50 from the West African Examinations Council (WAEC) Physics 2014 Objective paper, with the correct answer and a full explanation.
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An element of nucleon number P and atomic number Q emits an alpha particle from its nucleus. The resultant numbers of the new element formed are respectively
- A. P−4 and Q+2
- B. P−4 and Q−2Correct
- C. P+2 and Q+2
- D. P+2 and Q−2
Explanation
In alpha decay, the mass (nucleon) number decreases by 4 and the atomic number decreases by 2, giving P−4 and Q−2.
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