DP Physics (first assessment 2025)

Question 23M.1A.HL.TZ1.40

Date	May 2023	Marks available	[Maximum mark: 1]	Reference code	23M.1A.HL.TZ1.40
Level	HL	Paper	1A	Time zone	TZ1
Command term		Question number	40	Adapted from	N/A

40.

[Maximum mark: 1]

23M.1A.HL.TZ1.40

Radioactive nuclide X decays into a stable nuclide Y. The decay constant of X is λ. The variation with time t of number of nuclei of X and Y are shown on the same axes.

What is the expression for s?

A. $\frac{\ln 2}{λ}$

B. $\frac{1}{λ}$

C. $\frac{λ}{\ln 2}$

D. $\ln 2$

[1]

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E. Nuclear and quantum physics » E.3 Radioactive decay

Question 23M.1A.HL.TZ1.40

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