182. Two copper and aluminum wires of equal length, at a certain temperature, have equal electrical resistance. If the densities of copper and aluminum are respectively $9\,\dfrac{\text{g}}{\text{cm}^3}$ and $2.7\,\dfrac{\text{g}}{\text{cm}^3}$, and the specific resistance of copper is $\dfrac{1}{2}$ times the specific resistance of aluminum, how many times is the mass of the aluminum wire compared to the copper wire?
- [(1)] $\dfrac{3}{5}$
- [(2)] $\dfrac{4}{5}$
- [(3)] $\dfrac{5}{4}$
- [(4)] $\dfrac{5}{3}$
Workspace%% Page 16
Physics 120-A Page 15