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Unformatted text preview: .................. ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... (This question continues on the following page) 881-181 –5– N01/430/S(3) (Question A2 continued) (c) Calculate the energy lost in the collision. [3] ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... 881-181 Turn over –6– N01/430/S(3) OPTION B — ATOMIC AND NUCLEAR PHYSICS EXTENSION B1. A transmission electron microscope uses the wave properties of electrons to study things too small to be observed using an optical microscope. A potential difference is used to accelerate the electrons into a beam. If the de Broglie wavelength of the electrons in a particular beam is 1.0 × 10 (a) −10 m, calculate the momentum of an electron in the beam. [2] ......................................................................... ......................................................................... ......................................................................... (b) calculate the kinetic energy of an electron in the beam. [3] ......................................................................... ......................................................................... ......................................................................... (c) calculate the accelerating potential difference. [2] ......................................................................... ......................................................................... ......................................................................... (d) On the axes below, sketch a qualitative graph to show how the wavelength of the beam varies with accelerating potential difference. The general shape is all that is required, without the values. Wavelength of beam Accelerating potential difference 881-181 [3] –7– N01/430/S(3) B2. Carbon-15 and Nitrogen-15 both have the same mass number and in principle can transform into each other as shown below: Reaction I: 15 6 C →15 N + −01 β + υ 7 Reaction II: 15 7 N →15 C + +01 β + υ 6 Their nuclear masses are given in the table below: Isotope Carbon-15, Nuclear mass / u 15 6 Nitrogen-15, (a) C 15.007 306 15 7 14.996 265 N Explain, without doing any calculations, which reaction can take place spontaneously. [2] ......................................................................... ......................................................................... ......................................................................... (b) Calculate the energy released in the spontaneous reaction. [4] ......................................................................... ..........................................................................
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This note was uploaded on 09/30/2011 for the course CHEM 102 taught by Professor Tina during the Spring '11 term at Global.

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