Question

Determine at what temperature aluminum will have the same resistivity as tungsten does at 20°C.

a) Lower than 20°C
b) Equal to 20°C
c) Higher than 20°C
d) Cannot be determined

Answer 1

The temperature at which aluminum will have the same resistivity as tungsten at 20°C cannot be determined without the temperature coefficient of resistivity.

Step-by-step explanation:

In order to determine the temperature at which aluminum will have the same resistivity as tungsten at 20°C, we need to use the temperature coefficient of resistivity. The temperature coefficient of resistivity is a constant that relates the change in resistivity with a change in temperature. The equation to calculate resistivity is:

resistivity = resistivity0 * (1 + α * (T - T0))

Where resistivity0 is the resistivity at a reference temperature T0, α is the temperature coefficient of resistivity, T is the desired temperature, and resistivity is the resistivity at the desired temperature. Since we don't have the temperature coefficient of resistivity for both aluminum and tungsten, it is not possible to determine the temperature at which their resistivities are equal. Therefore, the answer is d) Cannot be determined.