h62pel 0506 exam0 - H62PELE1 ALEVEL2MODULE,...

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H62PEL-E1 The University of Nottingham SCHOOL OF ELECTRICAL AND ELECTRONIC ENGINEERING A LEVEL 2 MODULE, SPRING SEMESTER 2005-2006 PHYSICAL ELECTRONICS Time allowed ONE Hour Candidates must NOT start writing their answers until told to do so Marks awarded for sections of questions are shown in brackets after the relevant section Answer ALL parts of question ONE and EITHER question TWO OR question THREE Only silent, self contained calculators with a Single-Line display are permitted in this examination. Dictionaries are not allowed with one exception. Those whose first language is not English may use a  standard translation dictionary to translate between that language and English provided that neither language  is the subject of this examination. Subject specific translation dictionaries are not permitted. No electronic devices capable of storing and retrieving text, including electronic dictionaries, may be used. DO NOT turn examination paper over until instructed to do so H62PEL-E1 Turn Over
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H62PEL-E1 1.  Answer   all  six parts  of this question (a) What is the energy of a photon whose wavelength is 1560 nm? [2 marks] (b) Describe how the electronic band structure affects the electrical conductivity properties of a metal and a semiconductor. [5 marks] (c) Explain what holes are and why they are found in semiconductors, but  not in metals.
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h62pel 0506 exam0 - H62PELE1 ALEVEL2MODULE,...

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