A doped semiconductor has impurity levels 0.01 eV above the valence band
(i) Is the material n·type or p-type?
(ii) Find maximum wavelength of light which can create a hole in the valence band .

Explanation

(i)As impurity level exists just above valance band, it is a p-typc semiconductor.
(ii) Also, `E_g=(hc)/(lamda)`
`rArrlamda=(hc)/(E_g)=1.24xx10^(-6)m`