Isotope A has a decay constant of 0.723 s^-1 and isotope B has a decay constant of 0.514 s^-1.Which isotope has a longer half-life?

Question

Quizplus · Accepted Answer

The half-life of an isotope is given by the formula: 
t1/2 = ln(2)/λ
where λ is the decay constant. 
Since the decay constant for isotope B is less than that of isotope A, its half-life will be longer. Therefore, isotope B has a longer half-life.

Isotope a Has a Decay Constant of 0