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KVPY SX SB Exam 2015 Question Paper

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Question : 33

Total: 120

A donor atom in a semiconductor has a loosely bound electron. The orbit of this electron is considerably affected by the semiconductor material but behaves in many ways like an electron orbiting a hydrogen nucleus. Given that the electron has an effective mass of 0.07 m‌e, (where me is mass of the free electron) and the space in which it moves has a permittivity 13ε0, then the radius of the electron's lowermost energy orbit will be close to (The Bohr radius of the hydrogen atom is 0.53 Å)

0.53 Å
243 Å
10 Å
100 Å

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