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Temperature dependence of resistivity

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A resistance thermometer uses a copper wire as the temperature sensor. The resistance of the wire is 50, point, 0, space, \Omega at ice-point and 69, point, 0, space, \Omega at steam-point.
What is the temperature measured by the thermometer if the resistance is measured at 55, point, 0, space, \Omega?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, start text, p, i, end text or 2, slash, 3, space, start text, p, i, end text
degrees, start text, C, end text