Question

Young's modulus of steel is $19\times {10}^{10}{Nm}^{-2}$. Its value in dyne ${cm}^{-2}$ is:

• A. $19\times {10}^{11}$
• B. $19\times {10}^{17}$
• C. $19\times {10}^{13}$
• D. $19\times {10}^{21}$

Answer 1

The correct option is A $19\times {10}^{11}$

$1N={10}^{5}dyne$
$1m=100cm$
Thus, $19\times {10}^{10}N/m^2=19\times {10}^{10}\times {10}^5/(100{)}^2=19\times {10}^{11}$