12.2 Nuclear Physics

The graph shows the scattering of electrons due to diffraction by oxygen-16 nuclei.

Which point on the graph represents the first minimum?

What do the deviations from the Rutherford scattering give evidence for?

What is the radius of cobalt-27?

Which graph shows how intensity I varies with angle θ when electrons are diffracted by a nucleus?

Which of the following is the unit for the decay constant λ?

Which of the following graphs of the number of undecayed nuclei N over time has the smallest decay constant?

Which of the following provides evidence for the existence of neutrinos?

When alpha particles of speed v are directed at nuclei with atomic number A, scattering occurs. Small deviations from the predicted intensity of the scattered particles are observed.

Which change in nucleon number and energy will give the greatest deviation from the Rutherford scattering predictions?

A radioactive element has a decay constant λ. At time, t = 0 the number of nuclei of this element is N₀. These are linked by the equation  where N_t is the number of nuclei expected at time t. 

What number of nuclei would you expect to remain after 1 second?