WAEC Physics 2016 Objective — Question 48

Question 48 of 50 from the West African Examinations Council (WAEC) Physics 2016 Objective paper, with the correct answer and a full explanation.

48. Which of the following graphs is correct for the decay of a radioactive substance with a half-life of 2 years?

A. Graph A
B. Graph BCorrect
C. Graph C
D. Graph D

Explanation

The number (N) of radioactive nuclei present at any time t during radioactive decay follows N=N₀e^(-λt), an exponential decay curve, matching Graph B.

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