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A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength |
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Answer» 6000 Å `rArr "" lambda_(0) le (hc)/(e E_(g)) or lambda le(6.63 xx 10^(-34) xx (3 xx 10^(8)))/((1.6 xx 10^(-19)) xx 2.5) or lambda_(0) le 5 xx 10^(-7)` m Thus , light of wavelength 4000 Å `(or 4 xx 10^(-7) m)` only can be detected by the photodiode. |
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