Physics

Problem

The density of aluminium is

\rho = 2.7 \times 10^{3}\,\text{kg}\,\text{m}^{-3}

. Its Young’s modulus and bulk modulus are

Y = 7.0 \times 10^{10}\,\text{Pa}

and

B = 7.5 \times 10^{10}\,\text{Pa}

, respectively. The speed of a longitudinal sound wave along an aluminium rod is closest to a)

5.3 \times 10^{3}\,\text{m}\,\text{s}^{-1}

9.8 \times 10^{3}\,\text{m}\,\text{s}^{-1}

5.1 \times 10^{3}\,\text{m}\,\text{s}^{-1}

3.6 \times 10^{3}\,\text{m}\,\text{s}^{-1}