A-P type semiconductor has acceptor level 57meV above valence band. What is the maximum wavelength of light required to create a hole.

Explanation

`E=(hc)/(lambda), lambda=(hc)/(E )`
`=(6.62 xx 10^(-34) xx 3 xx 10^(8))/(57 xx 10^(-3) xx 1.6 xx 10^(-19)) =21.77 xx 10^(4) Å`