A thermometer made of platinum has a resistance of 50 at 20 C, what is the measured temperature (in units of C) when it's resistance is 84.7. Assume the temperature coefficient of resistivity to be = 3.92 × 10^-3 C^-1

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.