The accepted value of the Young modulus of copper is 117 GPa117\text{ GPa}117 GPa. In an experiment to determine this property, a student measures the extension of a copper wire under various loads and calculates a value of 128 GPa128\text{ GPa}128 GPa.
What is the percentage difference between the student's experimental value and the accepted value?
8.6%8.6\%8.6%
9.0%9.0\%9.0%
9.4%9.4\%9.4%
11%11\%11%
