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Asked in NEET 2008 · Photodiode and solar cell
Idea: absorption starts at the frequency whose photon energy just equals the gap, so set h u=E_g.
Find the matching wavelength first: λ=(hc)/(E_g)=(12400 eV A)/(2.0 eV)=6200 A.
u=c/λ=(3×10⁸)/(6200×10⁻¹⁰).
u=4.84×10¹⁴ Hz≈5×10¹⁴ Hz.
Anything below this is too weak per photon; anything above is absorbed.
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