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Question 22M.1.HL.TZ1.25

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

A pure sample of iodine-131 decays into xenon with a half-life of 8 days.

What is number of iodine atoms remainingnumber of xenon atoms formed after 24 days?

A.  18

B.  17

C.  78

D.  87

[1]

Markscheme

B

Examiners report

The majority of candidates correctly selected option B. This question had the highest discrimination index on the HL paper.

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