WAEC Physics 2014 Objective — Question 49
Question 49 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 aluminium foil is placed across a beam of radiation from a radioactive source. Which of the following types of radiation will be stopped by it?
- A. Alpha and beta particlesCorrect
- B. Alpha and gamma particles
- C. Beta and gamma particles
- D. Gamma particles only
Explanation
An aluminium foil, being a moderately thin barrier, will stop alpha particles (stopped by paper) and beta particles, but gamma radiation will pass through.
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