IB Physics SL E.3.11 Activity, count rate and half-life Question Bank
Practise IB Physics SL/HL E.3.11 by applying activity, count rate and half-life concepts to exam-style physics questions.
- Syllabus
- First assessment 2025
- Course
- Physics SL
- Level
- SL
Exam points
- identify the relevant physical quantity, model or diagram
- apply the correct equation and units to the evidence
- justify the result using conservation laws, fields or energy relationships
E.3.11—Activity, count rate and half-life question 1
Question (a)
(a)
The isotope tritium (hydrogen-3) has a radioactive half-life of 12 days.
[ 1 ]
Question (i)
(i)
Define radioactive half-life.
[ 1 ]
Question (b)
(b)
A sample of tritium has an activity of at time t=0. The half-life of tritium is 12 days.
[ 2 ]
Question (i)
(i)
Using the axes below, construct a graph to show how the activity of the sample varies with time from t=0 to t=48 days.
[ 2 ]
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