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The sample was divided twice in one hour, hence the half life is 1/2 hour or 30 minutes.
define half life ?
The half-life (symbol t1/2) is the amount of time it takes for a quantity (of material) to be reduced to half of its initial value. In nuclear physics, the phrase is typically used to indicate how rapidly unstable atoms undergo radioactive decay or how long stable atoms survive. The phrase is sometimes used more broadly to describe any form of exponential (or, in rare cases, non-exponential) decay. The biological half-life of medications and other compounds in the human body, for example, is referred to in the medical sciences. In exponential growth, the inverse of half-life is doubling time.
The original word, half-life time, was abbreviated to half-life in the early 1950s after Ernest Rutherford discovered the idea in 1907. Rutherford used the half-life concept of radioactive elements in his age studies.
We reduced the amount from 20 to 5 grammes.
This signifies that the sample was divided in half twice.
20/2 = 10
10/2 = 5
The sample was divided twice in one hour, hence the half life is 1/2 hour or 30 minutes.
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