half-life
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
The time it takes for half of a radioactive substance to decay.
Test yourself
Which word fits the gap? "Carbon-14 has a _____ of about 5,730 years."
Answer: half-life
In your own words, what does "half-life" mean?
The time it takes for half of a radioactive substance to decay.
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