Units (Radioactivity)
2 marks · NormalA radioactive source emits 150 decays in 2.5 minutes. Calculate its activity in Bq.
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1.0 Bq (±0.1)
Also accept: 0.99; 1.0
Common mistakes: 150/2.5=60; not converting to seconds
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Marking points
M1 · 1 mark · Correctly convert 2.5 minutes into seconds (2.5 x 60 = 150 s)
A1 · 1 mark · Correctly calculate and state the activity in Bq (1.0 Bq) with correct unit
Worked solution