DP Physics (first assessment 2025)

Question 19N.1A.HL.TZ0.40

Date	November 2019	Marks available	[Maximum mark: 1]	Reference code	19N.1A.HL.TZ0.40
Level	HL	Paper	1A	Time zone	TZ0
Command term		Question number	40	Adapted from	N/A

40.

[Maximum mark: 1]

19N.1A.HL.TZ0.40

A pure sample of a radioactive nuclide contains N₀ atoms at time t = 0. At time t, there are N atoms of the nuclide remaining in the sample. The half-life of the nuclide is $t_{\frac{1}{2}}$ .

What is the decay rate of this sample proportional to?

A. N

B. N₀ – N

C. t

D. $t_{\frac{1}{2}}$

[1]

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

Question 19N.1A.HL.TZ0.40

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