In a laboratory

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

In a laboratory, the speed of longitudinal sound waves in a steel rod is measured to be

5.0\times10^{3}\,\text{m s}^{-1}

. If the density of the steel is

7.8\times10^{3}\,\text{kg m}^{-3}

, determine the Young’s modulus of the steel. (a)

1.3\times10^{11}\,\text{Pa}

(b)

3.9\times10^{11}\,\text{Pa}

(c)

1.95\times10^{11}\,\text{Pa}

(d)

7.8\times10^{7}\,\text{Pa}