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Ees305:Isotope Geology Question Paper

Ees305:Isotope Geology 

Course:Isotope Geology

Institution: University Of Eldoret question papers

Exam Year:2013



Answer all questions
1.a)If Z represents the number of protons,N the number of neutrons and A the atomic mass of an atom ,define the following in terms Z,N and A:
(i)Isotopes (2marks)
(ii)Isotones (2marks)
(iii)Isobars (1mark)
b)What is a nuclide?Give an example using a symbol.(3marks)
c)What is mass defect in an atom?(2marks)
2.a)Define radioactive decay of an atom.(5marks)
b)What is beta decay?(5marks)
3.a)Given N as the number of parent atoms present at a given point in time,give the mathematical equation that describes the radioactive process.Explain all terms in the expression you give.(3marks)
b)What is half-life(T1/2) of a radioactive atom?Give the mathematical expression for half-life in terms of the decay constant.(4marks)
c)Describe briefly,the three essential parts of a modern Nier-type mass spectrometer.(3marks)




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