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A level: Radioactivity Questions

Q1.

(a)

(i) Sketch a graph to show how the neutron number, N, varies with the proton number, Z, for naturally occurring stable nuclei over the range Z = 0 to Z = 90. Show values of N and Z on the axes of your graph and draw the N = Z line.

(ii) On your graph mark points, one for each, to indicate the position of an unstable nuclide which would be likely to be an emitter, labelling it A, a emitter, labelling it B. (5 marks)

(b) State the changes in N and Z which are produced in the emission of

(i) an particle,

(ii) a particle. (2 marks)

(c) The results of electron scattering experiments using different target elements show that

where A is the nucleon number and ro is a constant. Use this equation to show that the density of a nucleus is independent of its mass. (3 marks)

(Total 10 marks)