Units (Radioactivity)
1 mark · EasyWhen recording how long it takes for a radioactive source's activity to fall to half, which two units of time might be used?
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minute and second
Also accept: minutes and seconds; second and minute; seconds and minutes
Common mistakes: hour; day; Bq
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Marking points
B1 · 1 mark · Gives both 'minute' and 'second' as units.
Worked solution
Minutes and seconds are both suitable units for measuring time in radioactivity experiments.