Physics, 10.07.2019 18:30 barisegebalci2352
Assume that the t = 0 version of the fermi-dirac distribution, namely 1 f (e) exp [e e)/(kbt) +1 in the usual notation, with ep the fermi energy, applies for t> 0. sketch, on the same axes, the distribution for t = 0 and for t> 0, marking the fermi energy and indicating the thermal energy kbt 5 marks (b) in the sommerfeld model (free electron quantum gas), each electron occupies (n/l)3 of k-space volume. remembering that we must count only positive k-states (i. e. ki > 0; ky0; k0), show that the density of k-states is g(k) = k2/72 6 marks (c) the density of energy states g(e) in the sommerfeld model is 2m$/2 ve 2h3 g(e)= give an expression for and sketch the density of occupied states at t 0 and at [4 marks t0 (d)consider a cube of metal with sides of length l which forms lattice constant a. assume that there is one atom per lattice site and that each atom simple cubic lattice with a contributes one electron to the free electron fermi gas. use the free electron model to find the radius of the fermi sphere and the fermi energy
Answers: 3
Physics, 22.06.2019 04:00
All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction
Answers: 2
Physics, 22.06.2019 06:40
Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?
Answers: 2
Physics, 22.06.2019 18:10
Which of the following statement is false ? a.batteries should never be stored on metal trays or outside in the elements)b, battery acid cannot be neutralized)c.do not stack batteries on top of each other)d.never put a damaged battery in a dumpster. i
Answers: 1
Physics, 22.06.2019 19:50
Aleaky 10-kg bucket is lifted from the ground to a height of 15 m at a constant speed with a rope that weighs 0.7 kg/m. initially the bucket contains 45 kg of water, but the water leaks at a constant rate and finishes draining just as the bucket reaches the 15-m level. find the work done. (use 9.8 m/s2 for g.) show how to approximate the required work by a riemann sum. (let x be the height in meters above the ground. enter xi* as xi.) lim n → ∞ n (9.8)(45−3 xi) i = 1 δx express the work as an integral. 0 dx evaluate the integral. (round your answer to the nearest integer.) j
Answers: 3
Assume that the t = 0 version of the fermi-dirac distribution, namely 1 f (e) exp [e e)/(kbt) +1 in...
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