Homework Statement
The activity (decays per second) of a certain radionuclide is observed to decrease by 87.5% in 30 hours.
What is the half-life of the radionuclide?
Homework Equations
(1) A(t) = A_{0}e^{-λt}
(2) T(1/2) = 0.693/λ
The Attempt at a Solution
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Homework Statement
Calculate the number of proton-proton reactions that occur in the Sun each second. For simplicity consider only the energy generation produced by the PPI chain. Consider that the Sun produces its energy in a steady state from the pp chain.
Homework Equations...