Answer to Question #140771 in Physics for s

Question

Different metals have different densities. Aluminum has a density of 2700 kg/m3, iron has 7860 kg/m3, and copper has 8940 kg/m3. Rank these materials in terms of speeds of sound in them from slowest to fastest

Answer 1

The speed of sound in a solid material is proportional to:

$$c \propto\dfrac{1}{\sqrt{\rho}}$$

where $\rho$ is the density of the material and a proportionality constant slightly depends on the type of material.

Thus, have the following order: Cooper, Iron, Aluminum.

Answer. Cooper, Iron, Aluminum.