QUANTUM PHYSICS MCQ PLEASE HELP

Post by **answerhappygod** » Mon Jul 11, 2022 1:05 pm

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Which statement about an electrical conductor and insulator is true: A conductor donates an odd number of valence electrons to the crystal lattice. O A conductor has a full conduction band of electrons, making all of them available for conduction. O An insulator has a partially filled conduction band of electrons, allowing for easier energy transitions. A conductor has a higher electron density than an insulator. A conductor donates an even number of valence electrons to the crystal lattice. O A conductor has more electrons than an insulator.
In a finite temperature fermionic system, if the chemical potential is held constant and the temperature increased, the following is true O The average number of particles in a single particle state will increase for any energy. The average number of particles in a single particle state will decrease for any energy. O It depends on the size of the temperature increase. The system remains unaffected. O The average number of particles in a single particle state, for O The average number of particles in a single particle state, for <μ, will increase. <μ, will decrease.
Which statement about the "hole recombination current" is INCORRECT: O It is not due to thermally excited electrons from the p-region. O It is independent of the external potential and due to the intrinsic semiconductor properties only. O It is due to thermally excited holes from the p-region. O It is dependent on the external potential applied by a battery. O It is proportional to the density of holes on the p-side. O It recombines holes and electrons in the n-region.
A subatomic particle trapped in an infinite square well between x = 0 and x = D² has normalised wave functions and energies It is prepared with wave function - sin (152) On = En h² nπ² 2m w in that region. Answer the following: 1. Does the trapped particle with wave function have a well-defined energy? [3 marks] a) Yes, it is the sum of all the eigenstate energies. b) Yes, it is the average energy of all the eigenstates. c) Yes, it is its maximum emery. d) No, the energy sum cannot be performed. e) No, the average would be zero. f) No, it does not solve Schrodinger's equation.