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4.2.4-Half-life
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Total cards: 7•Content version: v4•Public deck•Updated: 8/1/2026
Card preview (7)
#1
Front (Question)
First meaning of Half-life
Back (Answer)
Is the average time taken for the number of radioactive nuclei to halve.
#2
Front (Question)
The activity of a radioactive substance is measured
Back (Answer)
In Becquerel (Bq)
#3
Front (Question)
Count rate
Back (Answer)
The number of radioactive counts reaching per second.
#4
Front (Question)
Half-life
Back (Answer)
The time taken for the activity to fall to half of its initial value.
#5
Front (Question)
The calculation
Back (Answer)
The level of radiation due to substance= Level of radiation with substance + background radiation - Level of background radiation
#6
Front (Question)
How to work out the level of background radiation?
Back (Answer)
By using a Geiger counter
#7
Front (Question)
Does a substance’s mass halve over a half-life?
Back (Answer)
No, the half-life is not the time taken for the mass of a radioactive sample to halve.