A p type semiconductor has acceptor levels 57 meV above the valance band. The maximum wavelength of light required to create hole is (Planck constant h = 6.6 × 1 0 − 34 Js )

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Given: ​ E = 57 meV = 57 × 1 0 − 3 × 1.6 × 1 0 − 19 J E = λ hc ​ λ = E hc ​ = 57 × 1.6 × 1 0 − 22 6.6 × 1 0 − 34 × 3 × 1 0 8 ​ λ = 57 × 1.6 × 1 0 − 22 6.6 × 3 × 1 0 − 26 ​ λ = 0.2171052 × 1 0 − 4 m λ = 217105.2 × 1 0 − 10 m λ = 217105 A ˚ (Approx.) ​

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