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Question 22M.2.SL.TZ2.5b

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.SL.TZ2.5b
Level SL Paper 2 Time zone TZ2
Command term Estimate Question number b Adapted from N/A
b.
[Maximum mark: 2]
22M.2.SL.TZ2.5b

An experiment is carried out to determine the count rate, corrected for background radiation, when different thicknesses of copper are placed between a radioactive source and a detector. The graph shows the variation of corrected count rate with copper thickness.

(b)

When a single piece of thin copper foil is placed between the source and detector, the count rate is 810 count minute−1. The foil is replaced with one that has three times the thickness. Estimate the new count rate.

[2]

Markscheme

thickness is 0.25 «mm» ✓

380 «count min−1» ✓

 

MP1 and MP2 can be shown on the graph

Allow a range of 0.23 to 0.27 mm for MP1

Allow ECF from MP1.

Accept a final answer in the range 350 – 420

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