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Question 2 Not yet answered Marked out of 10.00 Figure shows the parabolic E versus k...
Question 4 Not yet answered Marked out of 10.00 The following table shows the number of...
Question 4 Not yet answered Marked out of 10.00 The following table shows the number of pieces of junk mail that arrives in my mailbox each day. X:No. of 2 3 4 5 6 pieces of junk mail P(X) 0.15 0.25 0.3 0.25 0.05 P Flag question What is the probability that 5 or fewer pieces of junk mail will be received today? Select one: a. 0.65 b. 0.85 0.9 o d.o.75
2.A. (15 points) The E versus k diagrams for a free electron (curve A) and for...
2.A. (15 points) The E versus k diagrams for a free electron (curve A) and for an electron in a semiconductor (curve B) is shown in the figure on the right. Sketch dE/dk versus k and dE/dk' versus k for each curve. What conclusion can you make about the effective masses in each of the two cases? 2.B. (15 points) The Fermi energy level for a particular material at T = 350 K is 2.50 eV. The electrons in this...
3. The figure below shows a schematic of the dispersion for the conduction and valence bands...
3. The figure below shows a schematic of the dispersion for the conduction and valence bands for particular semiconductor. The conduction band has dispersion equation a 10-35 E (3 x 10 19) [2 x 10 and the valence band has dispersion equation E (4 x 10-37A2 where in both cases E is in units of joules and k in units of m1 E 6x 10-19 J 2 6 x 10 m -6 -4 -2 2 k (a) Is this a...
Question 3 Not yet answered Marked out of 10.00 Given the wavefunction Ψ(x) = Acos(mx/2)e-iwt for...
Question 3 Not yet answered Marked out of 10.00 Given the wavefunction Ψ(x) = Acos(mx/2)e-iwt for -2<x<+2 what is the normalization constant? Answer
Not yet answered Points out of 10.00 P Flag question The figure below shows a uniform...
Not yet answered Points out of 10.00 P Flag question The figure below shows a uniform beam of length L= 1.0 m and mass M=4.1 kg which is held in a horizontal position by two cables. If the tension in the cable attached to the left end of the beam is given by T_L=13.8 N, what is the distance between the two cables (x)? TL TR Select one: 0.59 m 0.69 m 0.66 m 0.76 m 0.61 m
Question 1 Not yet answered Marked out of 1.00 The area of the plane figure bounded by the curve y:23 and the Ox axis (y20)is equal to k.π. Find k. Answer ? Flag question Question2 Not yet answered T...
Question 1 Not yet answered Marked out of 1.00 The area of the plane figure bounded by the curve y:23 and the Ox axis (y20)is equal to k.π. Find k. Answer ? Flag question Question2 Not yet answered The area of the plane figure bounded by one leaf of the curve ?'-9 cos3p is equal to k-T. Find k Marked out of Answe: 1.00 P Flag question
Question 1 Not yet answered Marked out of 1.00 The area of the...
Please circle your final answer! Question 13 Not yet answered Marked out of 10.00 Solve the...
Please circle your final
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Question 13 Not yet answered Marked out of 10.00 Solve the following initial value problem. dy/dx + 3xy - 2x e^(-x) = 0 (first order linear DE) y(0) = 1000 Note that a b = ab. Flag question Select one: O a. y = (x2 + 1000)^{-x} O b. y = (x2 - 100)^{-x*} C. y =( X2 - 1000)^{-x*} d. y = (2x2 + 1000)^{-x}
a,b,c 3. The E- k diagrams for a free electron and for an electron in a semiconductor are shown in the next figure. (a) Which curve A or B presents the free electron? Explain your answer (b) Usin...
a,b,c
3. The E- k diagrams for a free electron and for an electron in a semiconductor are shown in the next figure. (a) Which curve A or B presents the free electron? Explain your answer (b) Using the following graphs, sketch for the two electrons: *The group velocity versus K . d'E/dk versus k. .The effective mass versus k. Particle A graphs: Particle B graphs: CL CI (c) What conclusion can vou make concerning a comparison in effective masses...
E(k)t Er K. 4. (Advanced Level) Graphene is a special type of material which is two- dimensional and has a linear E...
E(k)t Er K. 4. (Advanced Level) Graphene is a special type of material which is two- dimensional and has a linear E-k diagram. The conduction and valence bands touch each other at a singularity, known as the Dirac point. In the unexcited state, the valence band is completely filled, while the conduction band is completely empty From the E-k diagram shown above, deduce the equation of the E-k curve. Hence, from the equation you deduced, speculate the special properties of...
Question 1 Not yet answered Marked out of 1.00 Flag question Solve the following pair of...
Question 1 Not yet answered Marked out of 1.00 Flag question Solve the following pair of simultaneous equations. -3.- 5y = -13, 5x + 4y = 26. Give your answers exactly, as integers or single fractions. The solution is: x = y= Question 2 Not yet answered Marked out of 1.00 Flag question Suppose that the number of atoms of a particular isotope at time t (in hours) is given by the exponential decay function f(t) = -0.578. By what...
Question 4 Not yet answered Marked out of 10.00 The following table shows the number of pieces of junk mail that arrives in my mailbox each day. X:No. of 2 3 4 5 6 pieces of junk mail P(X) 0.15 0.25 0.3 0.25 0.05 P Flag question What is the probability that 5 or fewer pieces of junk mail will be received today? Select one: a. 0.65 b. 0.85 0.9 o d.o.75
2.A. (15 points) The E versus k diagrams for a free electron (curve A) and for an electron in a semiconductor (curve B) is shown in the figure on the right. Sketch dE/dk versus k and dE/dk' versus k for each curve. What conclusion can you make about the effective masses in each of the two cases? 2.B. (15 points) The Fermi energy level for a particular material at T = 350 K is 2.50 eV. The electrons in this...
3. The figure below shows a schematic of the dispersion for the conduction and valence bands for particular semiconductor. The conduction band has dispersion equation a 10-35 E (3 x 10 19) [2 x 10 and the valence band has dispersion equation E (4 x 10-37A2 where in both cases E is in units of joules and k in units of m1 E 6x 10-19 J 2 6 x 10 m -6 -4 -2 2 k (a) Is this a...
Question 3 Not yet answered Marked out of 10.00 Given the wavefunction Ψ(x) = Acos(mx/2)e-iwt for -2<x<+2 what is the normalization constant? Answer
Not yet answered Points out of 10.00 P Flag question The figure below shows a uniform beam of length L= 1.0 m and mass M=4.1 kg which is held in a horizontal position by two cables. If the tension in the cable attached to the left end of the beam is given by T_L=13.8 N, what is the distance between the two cables (x)? TL TR Select one: 0.59 m 0.69 m 0.66 m 0.76 m 0.61 m
Question 1 Not yet answered Marked out of 1.00 The area of the plane figure bounded by the curve y:23 and the Ox axis (y20)is equal to k.π. Find k. Answer ? Flag question Question2 Not yet answered The area of the plane figure bounded by one leaf of the curve ?'-9 cos3p is equal to k-T. Find k Marked out of Answe: 1.00 P Flag question
Question 1 Not yet answered Marked out of 1.00 The area of the...
Please circle your final
answer!
Question 13 Not yet answered Marked out of 10.00 Solve the following initial value problem. dy/dx + 3xy - 2x e^(-x) = 0 (first order linear DE) y(0) = 1000 Note that a b = ab. Flag question Select one: O a. y = (x2 + 1000)^{-x} O b. y = (x2 - 100)^{-x*} C. y =( X2 - 1000)^{-x*} d. y = (2x2 + 1000)^{-x}
a,b,c
3. The E- k diagrams for a free electron and for an electron in a semiconductor are shown in the next figure. (a) Which curve A or B presents the free electron? Explain your answer (b) Using the following graphs, sketch for the two electrons: *The group velocity versus K . d'E/dk versus k. .The effective mass versus k. Particle A graphs: Particle B graphs: CL CI (c) What conclusion can vou make concerning a comparison in effective masses...
E(k)t Er K. 4. (Advanced Level) Graphene is a special type of material which is two- dimensional and has a linear E-k diagram. The conduction and valence bands touch each other at a singularity, known as the Dirac point. In the unexcited state, the valence band is completely filled, while the conduction band is completely empty From the E-k diagram shown above, deduce the equation of the E-k curve. Hence, from the equation you deduced, speculate the special properties of...
Question 1 Not yet answered Marked out of 1.00 Flag question Solve the following pair of simultaneous equations. -3.- 5y = -13, 5x + 4y = 26. Give your answers exactly, as integers or single fractions. The solution is: x = y= Question 2 Not yet answered Marked out of 1.00 Flag question Suppose that the number of atoms of a particular isotope at time t (in hours) is given by the exponential decay function f(t) = -0.578. By what...
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