Which statement is true for a metal

Options

A. `Y = eta`
B. `Y lt 1//eta`
C. `Y lt eta`
D. `Y gt eta`

Answer

D

Explanation

`because Y = 2 eta (1 + sigma)`
The practical value of `sigma` lies between 0 and 0.5.
For `sigma = 0, Y = 2 eta` and for `sigma = 0.5, Y = 2 eta (1 + 0.5) = 3 eta`
Thus `Y gt eta`.