hmwk9ans - Homework 9: Answers to Collected Problems...

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Unformatted text preview: Homework 9: Answers to Collected Problems Chapter 11: 40, 44, 50, 58, 82 Chapter 25: 4, 20, 26, 32, 58 44. Mg should look most similar to Be, whose band structure is given on page 454. The band associated with the 3s electrons of Mg would be filled with two electrons/orbital; but the 3p band is close enough in energy so that the two bands overlap—so there are more orbitals available than there are electrons to fill them. So Mg is a metal, not surprisingly. 50. Pure semiconductors have a strongly temperature- dependent conductivity; the only carriers are those with enough energy that by accident they reside in an “excited” state. Dopants introduce extra electrons (P in Si), or remove an electron that should be there (B in Si), so that either the extras can move in the conduction band, or the missing electron provides a hole for the other electrons to move in—in the valence band. Adding both kind of dopants generates holes, and the electrons required to fill in those holes—so nothing gets to move, anywhere. Chemistry 20 9 Homework #9 answers...
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This note was uploaded on 06/02/2008 for the course CHEM 2090 taught by Professor Zax,d during the Fall '07 term at Cornell University (Engineering School).

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hmwk9ans - Homework 9: Answers to Collected Problems...

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