DP Physics (first assessment 2025)

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Question 22M.1A.HL.TZ1.25

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.HL.TZ1.25
Level HL Paper 1A Time zone TZ1
Command term Question number 25 Adapted from N/A
25.
[Maximum mark: 1]
22M.1A.HL.TZ1.25

Three statements about radioactive decay are:

I.   The rate of decay is exponential.
II.  It is unaffected by temperature and pressure.
III. The decay of individual nuclei cannot be predicted.

Which statements are correct?

A.  I and II only

B.  I and III only

C.  II and III only

D.  I, II and III

[1]

Markscheme

D

Examiners report

Option B was the most frequent answer by candidates, suggesting that many candidates are unclear about the basic characteristics of radioactive decay.

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