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Ees412:Stable Isotopes Question Paper

Ees412:Stable Isotopes 

Course:Stable Isotopes

Institution: University Of Eldoret question papers

Exam Year:2014



Attempt all questions
1.a.What are isotopes?[2m]
b.What do you understand by the term "stable isotopes?"[3m]
c.The rate of radioactive decay is usually expressed in t 1/2.What is t 1/2?[2m]
d.Isotopic data are typically recorded as ð.What is ð-value?[3m]
2.Briefly describe genchemical applications of isotopes[5m]
3.The decay of radioactive substance follows an exponential relationship:
a.Show the exponential relationship with help of formula[3m]
b.A sample contains 14C compound.Given that half-life of 14C is 5,730 years:
i.Derive the decay constant value for 14C [3m]
ii.If the initial amount of 14C is 200g,how much of it will be left after 5,000
years?
iii.What time will it take for the 14c to decay to 3/4 of its initial mass?[2m]
4.Discuss isotopic effect with emphasis on differences exhibited by isotopic species in coexisting phases[5m]




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