WAEC Physics 2012 Objective — Question 50
Question 50 of 50 from the West African Examinations Council (WAEC) Physics 2012 Objective paper, with the correct answer and a full explanation.
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Uranium-234 disintegrated to form Thorium-230 by emitting
- A. A. alpha particlesCorrect
- B. B. gamma rays
- C. C. beta particles
- D. D. beta positive rays
Explanation
Alpha decay causes a decrease of 4 in mass number and 2 in atomic (proton) number, matching Uranium-234 (mass 234) decaying to Thorium-230 (mass 230): 234-92U -> 230-90Th + 4-2He (alpha particle).
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