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Sagot :
(a) 0.807 fraction of the sample will remain 3. 80 yr after its preparation of tritium.
What is half life?
Half life is the time taken for the radioactivity of a substance to fall to half its original value whereas mean life is average lifetime of all the nuclei of a particular unstable atomic species.
So if a radioactive element has a half life of one hour, this means that half of it will decay in one hour. After another hour, half of the remaining material will decay.
Example:
The radioactive isotope cobalt-60, which is used for radiotherapy, has, for example, a half-life of 5.26 years.
Tritium half life = 12.32 (T half)
Formula :
- N/N₀ = (1/2) ^ t/T (N/N₀ = Fraction ratio)
- t = 3.84
- T = 12.32
- N/N₀ = (1/2) ^ 0.308
- N/N₀ = 0.807
(a) 0.807 fraction of the sample will remain 3. 80 yr after its preparation of tritium.
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