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Questions and Answers
What is the correct formula for calculating the physical half-life of a radioactive substance?
What is the correct formula for calculating the physical half-life of a radioactive substance?
- $T_{1/2} = rac{ln 2}{ rac{1}{ au}}$ (correct)
- $T_{1/2} = rac{1}{ rac{ln 2}{ au}}$
- $T_{1/2} = rac{1}{ au}$
- $T_{1/2} = rac{ln 2}{ au}$
Which of the following best describes the biological half-life?
Which of the following best describes the biological half-life?
- The time it takes for half of a substance to decay spontaneously.
- The average time a radioactive isotope exists before its decay.
- The period in which a substance loses half its quantity due to natural processes in the body. (correct)
- A constant associated with the rate of radioactive decay.
In the decay equation $N_t = N_0 e^{-eta t}$, what does $N_t$ represent?
In the decay equation $N_t = N_0 e^{-eta t}$, what does $N_t$ represent?
- The decay constant for the isotopes.
- The total number of isotopes after time t.
- The initial number of undecayed nuclei.
- The number of undecayed nuclei at time t. (correct)
Which type of radioactive decay leads to the formation of lead isotopes as the final product?
Which type of radioactive decay leads to the formation of lead isotopes as the final product?
What is the mean life decay of a radioactive isotope, and how is it calculated?
What is the mean life decay of a radioactive isotope, and how is it calculated?
Flashcards
Radioactive isotopes
Radioactive isotopes
Unstable atoms whose nuclei spontaneously decay, releasing energy. They can be natural or artificially created.
Physical half-life (T1/2)
Physical half-life (T1/2)
The time it takes for half of the radioactive nuclei in a sample to decay. This is a fundamental property of each radioactive isotope.
Mean life (τ)
Mean life (τ)
The average time it takes for a radioactive nucleus to decay. It's directly related to the decay constant, which describes the rate of decay.
Biological half-life
Biological half-life
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Effective half-life
Effective half-life
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