Module: Option: From Quanta to Quarks

Question 30

Written Paper Section II Question 30 - 2001 HSC

(a) Define nucleon and contrast one property of nucleons. (b) Use the data provided in a table to calculate the energy of the photon emitted when an electron makes a transition between quantum levels. Draw the energy level diagram for hydrogen, indicating where the energy levels lie for quantum numbers greater than 4. Part (c) is not in the current syllabus. (d) Discuss the significance of the Manhattan Project for society. (e) Analyse how Chadwick’s and Fermi’s work resulted in a greater understanding of the atom.

Question 31

Section II Question 31 - 2002 HSC

(a) Describe Davisson and Germer’s experiment to confirm de Broglie's hypothesis of wave-particle duality. Explain the stability of the electron orbits in the Bohr atom, using de Broglie’s hypothesis. (b) Identify who suggested that the existence of the neutrino relates to the energy distribution of electrons emitted in β-decay. Assuming that the neutrino is massless, calculate the mass defect in the β-decay of a given isotope. Account for the energy distribution of electrons emitted in this β-decay. (c) Explain how the Balmer Series provides evidence in support of Bohr’s model of the hydrogen atom. Given a diagram of the Balmer Series, calculate the wavelength of the next line in the Series. (d) Discuss how neutron scattering and another process have increased understanding of the structure of matter.