b$)$ Compare your experimental Responsivity curve $($left$)$ with Selectivity information

pulled from a textbook $($right$).$ Why would you infer that the composition of

your $I{n}_{x}G{a}_{1-x}$ As photodiode material is NOT $x=0\mathrm{.}53?$

Absorption coefficient $()$ vs$.$ wavelength $()$ for various semiconductors

$($Data selectively collected and combined from various sources.$)$