What material has about 60 percent the conductivity of copper?

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Multiple Choice

What material has about 60 percent the conductivity of copper?

Explanation:
Metals differ in how easily electrons can move through them, which is what conductivity measures. Copper is known for excellent conductivity, so the material that’s about 60 percent as conductive as copper is aluminum. The typical room-temperature conductivities show copper around 5.8×10^7 S/m and aluminum around 3.5×10^7 S/m, giving a ratio close to 0.60. That combination—good conductivity, lighter weight, and lower cost—is why aluminum is commonly used where weight matters, even though it conducts less than copper. Silver would actually conduct better than copper, while nickel and gold conduct less than copper, so they don’t fit the “about 60 percent” cue.

Metals differ in how easily electrons can move through them, which is what conductivity measures. Copper is known for excellent conductivity, so the material that’s about 60 percent as conductive as copper is aluminum. The typical room-temperature conductivities show copper around 5.8×10^7 S/m and aluminum around 3.5×10^7 S/m, giving a ratio close to 0.60. That combination—good conductivity, lighter weight, and lower cost—is why aluminum is commonly used where weight matters, even though it conducts less than copper. Silver would actually conduct better than copper, while nickel and gold conduct less than copper, so they don’t fit the “about 60 percent” cue.

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