QUESTION 20 In Rutherford's model of atom, the size of the nucleus is estimated to b O 10:5 m O 10-10m O 10-15m O 10:20m

14:56 Sun 19 May 2 of 8 SECTION A qmplus.qmul.ac.uk Answer ALL questions in Section A Expect to use about half a page for each section A solution. Question A1 Give the term used in condensed matter physics for each of the following: a) The centre of the Brillouin zone [1 mark] b) A method for generating a neutron beam by bombarding a heavy metal target with protons [1 mark] c) The group of atoms associated with each lattice point in a crystal structure d) The Fourier transform of the lattice of a crystal [1 mark] [1 mark] e) A vibrational mode whose frequency tends to zero as the wavevector approaches zero [1 mark] f) A model of electronic structure in which electrons move in a weak, periodic potential and do not interact with each other by the Coulomb force [1 mark] Question A2 The body-centred cubic structure is common among metals. a) How many nearest neighbours has each atom in this structure? Give the nearest-neighbour distance in terms of the unit cell parameter a. [2 marks] b)…

Question 9 The HVL for lead atomic number 82 of attenuation 0.1 is 69.3 6.930 0.693 0.0693

When a bound electron moves to location further from the nucleus, which of the following are true? energy of electron increases because it takes energy input to separate positive and negative charges, and there is a decrease in the electrostatic potential energy of the electron energy of electron increases because it takes energy input to separate positive and negative charges, and there is an increase in the electrostatic potential energy of the electron energy of electron decreases because energy is released as positive and negative charges are separated, and there is a decrease in electrostatic potential energy of electron since it is now further away

The value of A in the element symbol below determines the isotope of the atom. True False

Whilst the vast majority of alpha particles passed through the gold foil with little or no deviation, a small fraction of them were scattered through larger angles, some even backwards.  Commenting on these findings Rutherford wrote “It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you.” Explain the implications of Rutherford’s results for models of atomic structure

Prove using the uncertainty principle that an electron cannot exist inside a nucleus.