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Question 19M.1.HL.TZ1.39

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.HL.TZ1.39
Level HL Paper 1 Time zone TZ1
Command term Question number 39 Adapted from N/A
39.
[Maximum mark: 1]
19M.1.HL.TZ1.39

The half-life of a radioactive nuclide is 8.0 s. The initial activity of a pure sample of the nuclide is 10 000 Bq. What is the approximate activity of the sample after 4.0 s?

A. 2500 Bq

B. 5000 Bq

C. 7100 Bq

D. 7500 Bq

[1]

Markscheme

C

Examiners report

Roughly half of candidates (incorrectly) selected response D, without recognizing that the change in activity over time is not linear.

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