The energy gap of a semiconductor is 1.10 eV. The maximum wavelength in Å at which it starts energy absorption will be -

11.284 112.84 1128.4 11284

11284

$E=\frac{hc}{λ}$ $λ=\frac{19.8×10^{-26}}{1.1×1.6×10^{-19}}=11284Å$