IB Physics SL E 3 11 Activity Count Rate and Half Life Questions
Calculate SL activity and count-rate changes from decay data, relating activity to decay constant, nuclei, time and half-life.
- Syllabus
- First assessment 2025
- Course
- Physics SL
- Level
- SL
Exam points
- Activity, count rate and half-life in radioactive decay.
IB Physics SL E 3 11 Activity Count Rate and Half Life Questions 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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