Chapter 17 - Physics of Solids - 9

Physics Class 12
1. Lead, copper and wrought iron are ductile.

2. Bohr model of electron distribution in an atom failed to explain electrical behaviour of materials.

3. When atoms are brought close to each other the energy level of isolated atom does not split to sub-levels.

4. The electrons in the outermost shell are called valance electron.

5. An intrinsic semiconductor has impurities in it.

6. In a semi conductor a hole behaves like a negative charge.

7. In a semiconductor electrons drift towards positive end while holes towards negative end

8. Any super conductor with a eritical temperature above 77Ks, the boiling point of Nitrogen, is called high temperature super conductor.

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