Physics – 5.2.4 Half-life | e-Consult
5.2.4 Half-life (1 questions)
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Definition: The half-life of a particular isotope is the time taken for half the nuclei of that isotope in any sample to decay.
Calculation:
- After 5730 years (1 half-life), the number of atoms remaining is 100,000 / 2 = 50,000.
- After another 5730 years (a total of 2 half-lives), the number of atoms remaining is 50,000 / 2 = 25,000.
Answer: The number of atoms remaining after 2 x 5730 years is 25,000.