Calculate the effective mass m* of electron with the momentum k- G/2 in a weak periodic potential U(r) = 2U0 cos(27x/a) for which the energy spectrum E(k) is given by Eq. (1.3.22) of Lect. 4. The mass m* is defined by the behavior of E(k) at k x G/2: h?q? E(k) = Em - G G 2m* Can m* be smaller or larger than the free electron mass?
Q: 50 kg. It is connected to a spring having a spring Body A in figure has mass m = constant k, = 4000 ...
A: The time period of oscillation is given by, T=phase1angular frequencyT=ϕωwhere,ω=km Let the equili...
Q: Explain the pinciple and working of a confocal microscope?
A: Principle: Similar to the widefield microscope, the confocal microscope uses fluorescence optics. In...
Q: A spool of thin wire (with inner radius r= 0.40m, outer R= 0.55m, and moment of inertia Icm=0.79 Kg*...
A: The inner radius of the wire is, r=0.40 m. The outer radius of the wire is, R=0.55 m. The moment of ...
Q: can you explain please?
A: Answer:- False. It points in opposite directions.
Q: Can you help me number 14. Finding the equation
A: Distance = initial velocity (time) + k(acceleration)(time) ²
Q: What is the volume of a hat box (cylinder) in liters, which is 60.0cm in diameter and 38.5cmtall ? (...
A: The diameter of the given cylinder is, d=60 cm=0.6 m. The height of the cylinder is, h=38.5 cm=0.385...
Q: What is a photon?
A: The photons are the smallest possible particle of light or electromagnetic radiation. In other words...
Q: How can we calculate path length difference to obtain constructiveinterference for a double slit?
A: To answer: Calculate path length difference to obtain constructive interference for a double slit
Q: Suppose one electron in H2 is excited from the s1s MO to the s1*s MO. Would youexpect the H atoms to...
A: a) The molecule would fall apart.b) The H atoms would remain bonded to each other.
Q: Can you help me 12 finding equation.
A: We know that, P ∝ T and P ∝ 1/ V So, on combining the equations, P ∝ T / V
Q: The quantities A and φ (called the amplitude and the phase) are undetermined by the differential equ...
A:
Q: The belt is travelling to the right at some speed v, while the pipe is rolling without slipping at w...
A: v=rω
Q: The range of human hearing is roughly from 20 Hz to 20 kHz. Based on these limits and a value of 343...
A: Frequency f =nv2L where, v is velocity n is integerL is length
Q: F= 20 (N) force is applied horizontally to the m2 = 2 (kg) block on a frictionless surface. Find the...
A: Given: Force is 20 N Mass is 5 kg m1=2 kg
Q: Which of the following equations are dimensionally correct? (a) vf = vi + ax (b) y = (2 m) cos (kx),...
A: Here, Dimension of physical quantities as vf=m/s=LTvi=m/s=LTa=LT2x=Landy=L2m= Lk=L-1
Q: One gallon of paint (volume = 3.78×10‒3m33.78 \times 10‒3 m^33.78×10‒3m3) covers an area of 25.0 m2m...
A:
Q: What are dichroic materials? Give some examples.
A: The material which helps in splitting of visible light into distinct beam of different wavelength is...
Q: What is Gibbs free energy ?
A: The Gibbs free energy is a thermodynamic potential that can be used to calculate the maximum reversi...
Q: B. Solve the following circuits (fill in the missing values). Remember to include your reasoning whe...
A: 1.) Refer to the figure below : The current is same through all the resistances as this is a serie...
Q: A uniform electric field of magnitude 400 V/m is directed in the positive x-direction. A 15 µC char...
A:
Q: Activity 3:Consider the circuits below with the following nominal values:Vz = 6.8 VIz(min) = 1 mAInp...
A: HI! Thank you for the question. As per the honor code, we are allowed to answer three sub-parts at a...
Q: A smooth rod of mass M, length L = 1 (m), is rotated at one end with a constant angular velocity w =...
A: Given : ω=4 rad/s m=0.01 kg v=2 m/s L=1 m Torque can be de...
Q: wp1) Please help with part a and part b, and if the solution is realistic only. Thank you.
A: The system of two loud speaker is given as speed of sound in air, V=343 m/s speed of person u=1.35 m...
Q: How does the energy contained in a charged capacitor change when a dielectric is inserted, assuming ...
A: Given, A capacitor and energy stored after insert a dielectric
Q: . The heating element in a toaster is made of Nichrome wire.Immediately after the toaster is turned ...
A: Given The heating element in a toaster is made of Nichrome wire. Immediately after the toaster is tu...
Q: What power of spectacle lens is needed to allow a farsighted person, whose near point is 1.00 m, to ...
A: The near point of the person is given as, 1.00 m (or) 100 cm The corrective lens is kept at a distan...
Q: P-type semiconductor with acceptor concentration N,=10°cm*and n=10° cm³, .= mp 15рg/С. 1000 cm/V-sec...
A: Given : P- type, NA = 1016 cm-3ni = 109cm-2μn = 1000 cm2/V...
Q: At what angle will light traveling in air be completely polarized horizontally when reflected from w...
A: When light is incident on a boundary between two media with different refractive index, some of it i...
Q: Special relativity does not apply to accelerating frames of reference. Explain?
A: In special relativity an accelerating particle's worldline is not straight. This isn't difficult to...
Q: What is the separation between two slits for which 610-nm orange light has its first maximum at an a...
A: The wavelength of the orange light is given as, λ = 610 nm (or) λ = 610×10-9 m The diffraction angle...
Q: A 1200-W electric resistance heating element whose diameter is 0.5 cm is immersed in 34 kg of water ...
A: Given information: The diameter of the heating element, D=0.5 cm=0.5×10-2 m The mass of the water, m...
Q: The pressure P of gas varies directly as the absolute temperature T and inversely as the volume V. T...
A: given,Pressure P of gas varies directly as the absolute temparature Tthat is P∝Tand inversely propor...
Q: Current Attempt in Progress Thin lenses. Object Ostands on the central axis of a thin symmetric lens...
A: f = + 19 cm as lens is converging. a) image distance, i = pf/ (p-f) = 13*19/-6 = -41.167 cm b) m =...
Q: 5-
A:
Q: Find the outward flux of the given field across the given cardioid. F =(3xy-)i+(e² +5tan-'y)j 1+y, r...
A: Green's theorem: Outward flux:∮CF·n ds=∬R∂M∂x+∂N∂ydx dyGiven that, F=3xy-5xy1+y2i+ex+5tan-1yjTherefo...
Q: A motorcycle begins at rest at t0 = 0 seconds. The motorcycle starts moving, and eventually covers a...
A:
Q: Just solve the part 2 just part 2
A: This is a problem base on relativity. We will solve this problem in the following steps, (a), (c) an...
Q: True or false for question 1: if false exlplain why A)The directed derivative of the voltage gives a...
A: (A) Introduction: The electric field is defined as the negative gradient of the potential. The gradi...
Q: What is the velocity of the mass center of the bar when it is in position 2 .
A: Given:- MA = IA.αmg.lα = ml23.αα = 3g2l
Q: H.W.2:For the semicircle line charge of (p, C/m) and radius (R m ) on (xy- plane) and its center is ...
A: Given, For the semi circle, The line charge is ρL Cm Radius is R m
Q: What is the spacing between structures in a feather that acts as a reflection grating, given that th...
A: This is a problem related to the diffraction of light through a reflection grating. In the above pro...
Q: A proton, an electron, and an alpha particle (of charge +2e) form an equilateral triangle of side le...
A: The charge of a proton is, qp=1.6×10-19 C. The charge of an electron is, qe=-1.6×10-19 C. The charge...
Q: Let X = c, the space of all conver gent sequences, andd de fined as d (r, y) = >lan - Ynl, then d is...
A: The requirements for distance function d to be a metric is, 1) d(x,y)=0 ⇔ x=y (iden...
Q: please solve b,c,d
A:
Q: A 20-kg child slides down a playground slide with a constant acceleration of a = 1.8 m/s2 parallel t...
A: given,mass=20kga=1.8m/s2v0 initial velocityd is slide length
Q: How can we find it?
A: Measurements of solar energy are typically expressed as total radiation on a horizontal surface,or a...
Q: LASER provide highly intense and amplified light. Support this statement by giving suitablearguments...
A: LASER : Light amplification by stimulated emission of radiation.
Q: T(C) 50 4. As a physicist, you put heat into a 600-g solid sample at the rate of 15 kJ/min while rec...
A: A) for latent heat of fusion use straight line so time = (2.5-1) =1.5 min SO Latent heat of fusion =...
Q: Let’s imagine that you have an idea for an experiment to fly on NASA’s “Vomit Comet.” (What’s specia...
A: The droplet is to move in a circular orbit of radius 14 cm or 0.14 mAs it moves in this circular orb...
Q: Assuming that all the numbers given are exact, what is John's position at a time of 4.35 s4.35 s? En...
A: what is John's position at a time of 4.35 s.given,total time(T)=4.35 svelocity-time graph
We have given that
Let us have an external force F is applied to electron in the band.
The work done in where, v is the velocity and in the time.
Now,
Trending now
This is a popular solution!
Step by step
Solved in 2 steps