KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 221 - 223 of 250
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Question number: 221
Question number: 222
Appeared in Year: 2015
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 0.07me, (where me is mass of the electron) and the space in which it moves has a permittivity , 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)