The energy gap of silicon is 1.14 eV. The maximum wavelength at which silicon will begin absorbing energy is

(a) 10888 Å                    (b) 1088.8 Å
(c) 108.88 Å                   (d) 10.888 Å

(a) λmax=hcE=6.6×10-34×3×1081.14×1.6×10-19=10888Å

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