Physics, 21.08.2019 02:30 egreer9287
In the nearly-free-electron model, energy gaps occur at values of wavevector corre- sponding to bragg reflection. (i) using this model, calculate the directions in a simple cubic structure in which the first, second and third energy gaps occur (ii) calculate the electron energies at which these gaps occur for a lattice constant a 4x 10-10 m. (b) the energy e of an electron in the conduction band of a metal is related to the wavevector k by e 2x 10-10 m. given the fermi wavevector is 2.618 x 109 m-1 and the fermi a sin2 ka. here, a is a constant and a is the lattice spacing - energy is 1 ev, determine the effective mass of the conduction electrons measured in a transport experiment that probes the electrons at the fermi level
Answers: 2
Physics, 21.06.2019 17:30, corynanderson16
The position of a dragonfly that is flying parallel to the ground is given as a function of time by r⃗ =[2.90m+(0.0900m/s2)t2]i^− (0.0150m/s3)t3j^. a: at what value of t does the velocity vector of the insect make an angle of 34.0 degree clockwise from the x-axis? b: at the time calculated in part (a), what is the magnitude of the acceleration vector of the insect? c : at the time calculated in part (a), what is the direction of the acceleration vector of the insect?
Answers: 1
Physics, 22.06.2019 07:00, marlenemedina247
World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course? a. 12.5 m/sb. 1.33 m/sc. 1.25 m/sd. 13.3 m/s
Answers: 2
In the nearly-free-electron model, energy gaps occur at values of wavevector corre- sponding to brag...
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