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6 Radioactivity

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Question 21

A university team adds a radioactive tracer to a sealed mixing tank and uses a radiation detector to monitor it. The tank is closed, so the activity of the tracer falls only because the tracer decays.

Time after the tracer was added in hoursActivity in MBq
6240
1260

Which of these gives the half-life of the tracer and its activity when it was added?

[1]
A

Half-life 666 hours; activity when added 480 MBq480\ \mathrm{MBq}480 MBq

B

Half-life 1.51.51.5 hours; activity when added 3840 MBq3840\ \mathrm{MBq}3840 MBq

C

Half-life 333 hours; activity when added 960 MBq960\ \mathrm{MBq}960 MBq

D

Half-life 333 hours; activity when added 480 MBq480\ \mathrm{MBq}480 MBq

Markscheme

6 Radioactivity Questions

  1. GCSE
  2. /Physics
  3. /6 Radioactivity

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