I\'m having trouble in solving this one. I know you\'d need the decay constant a

Question

I'm having trouble in solving this one. I know you'd need the decay constant and then use the rutherford soddy law but I get confused along the way. An explanation would be awesome. Thanks in advance.

I'm having trouble in solving this one. I know you'd need the decay constant and then use the rutherford soddy law but I get confused along the way. An explanation would be awesome. Thanks in advance. Tritium has a half-life of 12.3 years. How many years will years will elapse when the radiactivity of a tririum sample diminishes to 20% of its original value? 21 years 29 years 57 years 86 years

Explanation / Answer

half life = ln2 / k...where k = decay constant..

k=ln 2/12.3 years = 0.05634 / year

C = Co exp[-kt] ...Co = initial conc..C= remaining conc.

C/Co = 0.2 = exp[-0.05634 t]

-ln (0.2) = 0.05634 t

t = 28.566 ~ 29 years.

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.