CBSE Class 12-science Answered
from where does holes come and what is a band in solid because it has lattice structure and electrons move around in conductors the what is valence and conduction band?
Asked by Gaurav Avhad | 06 Jun, 2011, 08:57: PM
Expert Answer
Holes do not come or form. The molecules are loosely packed in structure by leaving lot of spaces between them. For example, The structure that forms in the solid ice crystal actually has large holes in it. Therefore, in a given volume of ice, there are fewer water molecules than in the same volume of liquid water. In other words, ice is less dense than liquid water and will float on the surface of the liquid.
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metals are unique as good conductors of electricity. This can be seen to be a result of their valence electrons being essentially free. In the band theory, this is depicted as an overlap of the valence band and the conduction band so that at least a fraction of the valence electrons can move through the material. |
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Answered by | 09 Jun, 2011, 01:39: PM
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