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The forbidden energy gap in germanium is 0.7 eV. The wavelength whose absorption is done by germanium is :

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The forbidden energy gap in germanium is 0.7 eV. The wavelength whose absorption is done by germanium is :
(a) 35000 Å
(b) 17700 Å
(c) 25000 Å
(d) 51600 Å

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The answer is (b) 17700 Å

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