DP Physics (first assessment 2025)

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Question 21N.1A.SL.TZ0.20

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Date November 2021 Marks available [Maximum mark: 1] Reference code 21N.1A.SL.TZ0.20
Level SL Paper 1A Time zone TZ0
Command term Question number 20 Adapted from N/A
20.
[Maximum mark: 1]
21N.1A.SL.TZ0.20

A detector measures the count rate from a sample of a radioactive nuclide. The graph shows the variation with time of the count rate.

The nuclide has a half-life of 20 s. The average background count rate is constant.

What is the average background count rate?


A.  1 s−1

B.  2 s−1

C.  3 s−1

D.  4 s−1

[1]

Markscheme

C

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