Advertisements
Advertisements
प्रश्न
The ______, a property of materials C, Si, and Ge depends upon the energy gap between their conduction and valence bands.
Advertisements
उत्तर
The conductivity, a property of materials C, Si, and Ge depends upon the energy gap between their conduction and valence bands.
Explanation:
The conductivity of materials like Carbon (C), Silicon (Si), and Germanium (Ge) depends on the energy gap between the valence band and conduction band. A smaller energy gap allows electrons to move easily to the conduction band, increasing conductivity. A larger energy gap results in lower conductivity.
संबंधित प्रश्न
Show variation of resistivity of copper as a function of temperature in a graph.
Using the concept of free electrons in a conductor, derive the expression for the conductivity of a wire in terms of number density and relaxation time. Hence obtain the relation between current density and the applied electric field E.
Define current density. Write an expression which connects current density with drift speed
Define the term 'electrical conductivity' of a metallic wire. Write its S.I. unit.
The following figure shows a conductor of length l with a circular cross-section. The radius of the cross-section varies linearly from a to b. The resistivity of the material is ρ. Assuming that b – a << l, find the resistance of the conductor.

An electrolysis experiment is stopped and the battery terminals are reversed.
The specification on a heater coil is 250 V, 500 W. Calculate the resistance of the coil. What will be the resistance of a coil of 1000 W to operate at the same voltage?
Assertion: Bending a wire does not effect electrical resistance.
Reason: Resistance of wire is proportional to resistivity of material.
