Respuesta :
Half-life is the amount of time it takes for the initial mass of the isotope to decompose, by half, into other lighter atoms.
Explanation:
Different radioactive isotopes have different half-lives. For example, the element technetium-99m has a half life of 6 hours. This means that is 100 kg of the element is left to decay, in 6 hours, 50kg of the mass will have changed into other elements/atoms. The half-life of uranium-238 is 4.5 billion years while that of polonium-216 is only 0.145 seconds.
Half-life can be calculated using the formulae;
In* (Nt/N₀) = - kt
Whereby;
Nt = mass of radioactive material at time interval (t)
N0 = mass of the original amount of radioactive material
k = decay constant
t = time interval (t1/2 for the half-life)
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Answer:
The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay.
Explanation:
A radioactive isotope decays overtime. This is due to its unstable nuclei. Hence, overtime, they break down and form a completely different type of atom.
Essentially, the time taken for the number of nuclei in the isotope to half. This number varies among isotopes too.
For example, the half-life of carbon-14 is 5,715 years, but the half-life of francium-223 is just 20 minutes.
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