DP Physics (first assessment 2025)

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Question 23M.1A.SL.TZ2.22

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1A.SL.TZ2.22
Level SL Paper 1A Time zone TZ2
Command term Question number 22 Adapted from N/A
22.
[Maximum mark: 1]
23M.1A.SL.TZ2.22

A student measures the count rate of a radioactive sample with time in a laboratory. The background count in the laboratory is 30 counts per second.

Count rate / counts per second Time / s
150 0
90 20

 

What is the time at which the student measures a count rate of 45 counts per second?


A.  30 s

B.  40 s

C.  60 s

D.  80 s

[1]

Markscheme

C

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