IB Physics HL E.3.19 Radioactive decay law Question Bank

Practise IB Physics HL E.3.19 by applying radioactive decay law concepts to exam-style physics questions.

Exam points

identify the relevant physical quantity, model or diagram
apply the correct equation and units to the evidence
justify the result using conservation laws, fields or energy relationships

[Maximum number: 3]

A ball is released near the surface of the Moon at time t=0. The point of release is on a straight line between the centre of Earth and the centre of the Moon. The graph below shows the variation with time t of the displacement s of the ball from the point of release.

Figure for Question E.3.19 (HL)—Radioactive decay law question 1 — IB Physics HL

In a pure sample of lead-212 at one instant, $8.0 \times 10^{-3} \mathrm{~kg}$ of the lead-212 is present. Calculate the mass of lead-212 that remains after a period of 35 hours.

use of $\lambda$ from (h)(i);
correct substitution into $N=N_{0} \mathrm{e}^{-\lambda t}$ ;
8.0 to $8.3 \times 10^{-4} \mathrm{~kg}$ ;

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E.3.19 (HL)—Radioactive decay law question 1