Table P12.75 lists the speed of sound and the density of diamond (a crystal composed of carbon) and several metals. Some authors use the Young?s modulus of a material as a measure of the material?s ?stiffness.? According to this measure, order the materials in the table from least stiff to most stiff.

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TABLE P12.75 Density and Speed of Sound in Several Materials Material Speed of sound (m/s) Density (kg/m³) Al 5,100 2,700 Cu 3,900 9,000 Diamond 12,000 10,000 Au 3,200 19,300 Fe 5,100 7,900