A Platinum Wire Is Used to Determine the Melting Point

question 26

Multiple Choice

A platinum wire is used to determine the melting point of indium. The resistance of the platinum wire is 2.000 Ω at 20°C and increases to 3.072 Ω as the indium starts to melt. What is the melting point of indium? The temperature coefficient of resistivity for platinum is 3.9 × 10^-3(C°) ^-1.

• A) 120°C
• B) 140°C
• C) 160°C
• D) 240°C
• E) 350°C

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