Use band theory to explain the changes in the resistance of an intrinsic semiconductor as temper changes.
At low temperatures(0K), the conduction band is empty while the valence band if filled. As temperature increases, the electrons gain energy to go into the conduction band and leave positive holes in the valence band. The lattice vibration increase, but it is outweighed by increase in charge carriers. Hence the current increases and resistance decreases.
KG
Related Physics A Level answers
All answers ▸From what height, h, should a rail-cart fall to complete a loop-the-loop of radius r without falling off a the track? Assume the track on which the rail-cart travels is smooth and express h in terms of r.
A cable with a diameter of 6mm is used to lift crate. Calculate the mass of the crate required to create a stress of 350 MPa.
How do I resolve forces on a slope?
A pendulum of mass m is released from height h with a speed v at the bottom of its swing. a) What is the gravitational potential energy at height h and the kinetic energy at the bottom of its swing? b) Use conservation of energy to define the speed v.