A tungsten wire is used to determine the melting point of indium. The resistance of the tungsten wire is 6.000 $\Omega$ at 20°C and increases to 9.700 $\Omega$ as the indium starts to melt. $\alpha$_tungsten = 4.50 * 10 ^- ³ (°C) ^- ¹. What is the melting temperature of indium? A) 351°C B) 731°C C) 132°C D) 157°C

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The change in resistance can be used to calculate the temperature change using the formula: R = R0(1 + αΔT). Solving for ΔT gives ΔT = (R/R0 - 1)/α. Substituting the given values: ΔT = (9.700/6.000 - 1)/(4.50 × 10^-3) = 137°C. Adding this to the initial temperature (20°C) gives the melting point of indium as 157°C.

A Tungsten Wire Is Used to Determine the Melting Point Ω\OmegaΩ

A Tungsten Wire Is Used to Determine the Melting Point $\Omega$