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CBSE Class 11-science Answered

 
Asked by aashish | 17 May, 2014, 03:19: PM
answered-by-expert Expert Answer
Solids are categorised into Conductors, Insulators or Semiconductors depending on their conductivities.
Now, all the three types of solids have a specific band gap between their conduction and valence bands.
For Conductors, the band gap is negligible as their conductivity is very high.
For Insulators, the band gap is very large as their conductivity is very low.
For Semiconductors, the band gap varies from the type of element used to make the semiconductor.
At normal temperature, a solid should have a particular conductivity to be classified as either of the three types.
The above mentioned values of conductivities are for a specific range of temperatures. These range will vary for different temperatures.
Hence, a solid having a conductivity between 10-6 and 10-10 can be classified as a semiconductor or an insulator depending on the temperature it is operated upon.
Answered by Romal Bhansali | 28 May, 2014, 01:14: PM

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