Question

For silver, Young's modulus is $7.25 \times 10 ^ { 10 } \mathrm {~N} / \mathrm { m } ^ { 2 }$ and Bulk modulus is $11 \times 10 ^ { 10 } \mathrm {~N} / \mathrm { m } ^ { 2 }$. Its Poisson's ratio will be

• A. – 1
• B. 0.5
• C. 0.39
• D. 0.25

Answer 1

Answer: (C)

0.39

Answer 2

$Y = 3 K ( 1 - 2 \sigma )$

$\sigma = \frac { 3 K - Y } { 6 K }$=$\frac { 3 \times 11 \times 10 ^ { 10 } - 7.25 \times 10 ^ { 10 } } { 6 \times 11 \times 10 ^ { 10 } }$ $\Rightarrow \sigma = 0.39$