Red-capillary Purple- Basement membrane Blue-podocyte
Hello everyone, Now my question is after something if filtered from the capillary how does it go to the podocyte. The basement membrane looks too thick with no pores to me, it seems to be blocking the passage of molecules. Thanks :smile:
Homework Statement
We have a potential structure as follows: from z=negative infinity to z=-b, the potential is 0. At z=-b, the potential jumps up to some V_0. Then, at z=0, there is a potential barrier of infinite height. I need to solve for the magnitude of the reflected wave (i.e. the wave...
I never made it down under to snorkel the Great Barrier Reef, but I've snorkeled other places around the world, and marvel at how some reefs seem to be teeming with life while others appear on the verge of death. I'm curious as to the effects all the flooding and now Cyclone Yasi might have on...
I know it may not even be mechanically possible to reach the speed of sound underwater (1,484 m/s); but this is just a theory.
After discussing with several people, what would happen if a submarine was to break the sound barrier underwater, a couple of interesting theories arose.
Going...
I'm currently studying Freidberg's plasma physics and fusion energy book, I've heard that Fusion between Deutrium and tritium is most suitable for a fusion reactor and how columb barrier plays its role....my question is
what happens when two neutrons fuse together? do they face columb collision?
How fast must a human throw a baseball in order to break the sound barrier? I know a jet breaks the sound barrier at approximately 750 mph but would it be the same for a human?
I am trying to find out what is the correct way to write the mathematical demarkation for the Coulomb Barrier.
You know, if I wanted to write the symbol for the radius of the coulomb barrier.
If anyone could show me it in the correct font that would be great.
NO, this isn't for...
b]1. Homework Statement [/b]
Consider a particle of mass m incident on a rectangular barrier with a potential
V(x) = V0 for 0 \leq x < w
V(x) = 0 otherwise,
where V0 is a positive constant. The particle has an energy E > V0. Find expressions in...
Homework Statement
a particle of kinetic energy E is incident from left on a potential barrier,height U, situated at the origin.the barrier is infinitely wide and E>U
obtain an expression for the reflection coefficient R of the particle as a fuction ratio e=E/U
Homework Equations...
Hi,
I'm trying to understand the quantum mechanical solution to this potential:
V(x) = \left\{\begin{array}{cc}\infty & \mbox{ for } x < 0,\\-\lambda\delta(x-d) & \mbox { for } x > 0\end{array}\right.
A particle of mass m is constrained to move on the half straight line \{x \in \mathbb{R}: x...
Having trouble drawing the wave representations for this diagram.
[PLAIN]http://img156.imageshack.us/img156/94/diag.png
I'm not sure what the incident and reflected waves should look like.
The question is asking to draw the waves in each region. I understand how to calculate the waves just...
Hope this is the right place for this question, but it is very inetresting to me so I wanted to ask some experts.
Can a propeller driven aircraft break the sound barrier?
My answer, no.
Any opinions will help
Thanks
Let's have a kind of step potential,
V=infinity, where x\leq0,
V=constant, where 0\leqx\leqa,
V=zero , where x\geqa.
Then, my question is that when the energy of the particle is lesser than zero, which
means that the particle is in the bound state, is there a probability of getting...
Friends,
I am trying to consider an impurity which can be viewed as a 1D resonant-tunnelling problem.
I gather that the transmission coefficients TL and TR will decay exponentially from the impurity to the edges of the barrier. However, I am unsure how to predict how the peak & area of T(E)...
Homework Statement
The well is set up exactly like this https://www.physicsforums.com/showthread.php?t=397977&highlight=potential+barrier+inside+an+infinite+square+well. It is basically a infinite potential well with a barrier in the center.
Basically I've got solutions for regions 1, 2...
Homework Statement
In delta potential barrier problem Schrodinger equation we get
\psi(x)=Ae^{kx}, x<0
\psi(x)=Ae^{-kx}, x>0
We must get solution of
lim_{\epsilon \rightarrow 0} \int^{\epsilon}_{-\epsilon}\frac{d^2\psi}{dx^2}dx
Homework Equations
The Attempt at a Solution
lim_{\epsilon...
Electron beam with kinetic energy E_{k} = 10 eV strikes a positive potential barrier V_{0} and the kinetic energy after the beam has passed through the barrier is E_{k} = (10 eV -V_{0}).
How big potential V_{0} is needed so that 40% of the electron beam is going to be reflected?
What...
Homework Statement
A beam of particles, each of mass m and kinetic energy E, is incident on a potential barrier
V(x) = V_0 \; \; for \; \; 0 \leq x \leq a
\; \; \; \; \; \; \; \; \; = 0 \; \; for \; \; x < 0 \; \; and \; \; x > a
E = V_0 \; \mbox{is the special case}
The part...
Electron beam with kinetic energy E_{k} = 10 eV strikes a positive potential barrier V_{0} and the kinetic energy after the beam has passed through the barrier is E_{k} = (10 eV -V_{0}).
How big potential V_{0} is needed so that 40% of the electron beam is going to be reflected?
What...
im generating potentials, however the coulomb is proving tricky. stumbling block is finding a way to write
A coth(2x) + B cosech(2x)= (A+B)/2 tanh(x)+(A_B)/2 coth(x)
i am at the RHS and need to get the tanh to come out which I am told can be done.
the a's and b's might not be quite right...
Homework Statement
In a particular atom, an alpha particle makes N collisions with a potential barrier in each second. The transmission coefficient at the barrier is 1.0e-15. In one second, 2.0e18 alpha particles are emitted from a group of 3.0e23 radioactive atoms.
Find N.
Homework...
Homework Statement
Consider particles incident on a potential energy step with E<U.
(That is, a particle with total energy E travels along one dimension where U=0, then crosses, at point x=0 into a region where U>E.) (The particle is incident on the potential energy step from the negative x...
Barrier potential, E> V0
V(X) = 0 ( x < 0 )
= V0 ( 0 < x < a )
= 0 ( x> a )
Psi(x)1 = Aexp[ik1x] + B exp[-ik1x]
Psi(x)2 = Cexp[ik2x] + D exp[-ik2x]
Psi(x)3 = Fexp[ik1x] + G exp[-ik1x] ( K3= K1 so I put k1 )
and G = 0 because there is no reflection,
I used B.C...
If you have a rectangular square potential barrier of some height, say \lambda/L, and thickness L, what is the transmission coefficient and what is its value in the limit that L goes to 0?
Thus you have the height of the barrier going to infinity, while the width goes to zero... Assuming...
Hey everyone,
For my a research project on quantum tunneling I have to tie in math somehow, so I was wondering if anyone could help me learn to calculate the probability of a wave (preferably like an electron or electrical voltage) of some sort passing through a rectangular barrier, which is...
Hello to all,
I am looking at a scattering example in my book. A particle is incident from the left with energy E > Vo. The barrier is of width L, and located between x = 0 and x = L.
The solutions to the time-independent Schrodinger equation in eacch of the regions comprising the left...
Homework Statement
To calculate the height of the potential barrier for a head on collision between two deuterons given that each deuteron is a sphere of radius R
Homework Equations
Potential of the first deuteron at a distance of 2R from it =V = ke/2R where k = 9 * 10^9 ,
e= 1.6 *...
Homework Statement
A projectile is thrown from the horizontal ground with a speed of 40 m/sec at an angle with the horizontal of 30 degrees. At what height will the projectile strike a high barrier located at a distance of 85m from the firing point?
Homework Equations
ok so: point A is...
Homework Statement
I am trying to find the coefficients in a Schrodinger equation approaching a finite potential.
https://www.physicsforums.com/showthread.php?t=203385
It is a problem similar to this, except a little easier. In my case, though, there is no V1 as shown in the picture at the...
Hi.
Firstly, can a particle every be found within the potential barrier?
I've used the search function to look for an answer for this question, but I didn't really get anything conclusive. However, from what I gather, since there is a probability associated with it being 'found'(meaning it...
Question:
Determine the transmission coefficient for a rectangular barrier. Treat separately the three cases E<0, E=Vo, E>Vo (note that the wave function inside the barrier is different in the three cases.
and
V(x) = Vo > 0 for -a < x < a
= 0 for |x| > a
I...
So I know this topic of tunneling has been discussed hundreds of times on this forum, but I simply cannot find nor deduce an answer to a burning question I have about what happens exactly INSIDE the barrier and how to describe it (preferably in layman's terms.)
The problem is basic: A...
HI,all
This is rajasekhar ,
Please guide me how to solve below problem.
An electron moves in a one-dimensional potential of width 8 angstroms and depth 12eV then how to found number of bound states present?
Thanks&Regaurds
HI,all
This is rajasekhar ,
Please guide me how to solve below problem.
An electron moves in a one-dimensional potential of width 8 angstroms and depth 12eV then how to found number of bound states present?
Thanks&Regaurds
Homework Statement
A particle of energy E approaches a step barrier of height U0. What should be the ratio E/U0 so that the reflection coefficient is 0.43?
Homework Equations
R=(k1-k2)^2/(k1+k2)^2 <--------reflection coefficient
The Attempt at a Solution
I am completely stumped...
Hello,
I was trying to design a movie in Matlab. A Gaussian wave packet moves toward double barrier then some wave reflect and some pass out from the barrier . i design the double barrier in Matlab. but don't know how to make movie in Matlab with Gaussian wavepacket. can you help. Do u have...
Sorry for such a simple question, but what are the differences between using insulation and heat reflective material? What is the effective of using them together?
In my case I want to shield flammable foam insulation from melting or catching fire from a nearby heater. Will covering the...
I'm unsure how to approach this, as solid blocks of materials next to each other (e.g. steel and air) with no barrier inbetween as shown on
http://en.wikipedia.org/wiki/Thermal_conductivity
"x" would equal zero, this can't be correct. Is there another equation relating temperature difference...
Homework Statement
A beam of electrons of KE = 100 eV is incident from the left on a barrier
which is 200 eV high and 10 nm wide. If the momentum spread is sufficiently
narrow, then a simple plane wave is a good approximation. Recall that the mass of an
electron is mc2 = 511 keV.
....._____...
Homework Statement
Consider the diagram described by: http://filer.case.edu/pal25/well.jpg
If a particle with E = \frac{-\hbar^2 q^2}{2m} comes in from negative infinity with amplitude 1, what is the wave function for negative x?
Oh and V(x) < -a and > a = 0
Homework Equations...
Homework Statement
Determine the transmission coefficient for a rectangular barrier. Treat seperately the three cases E<Vo, E>Vo, and E=Vo.Homework Equations
V(x)= +Vo if -a<xa
V(x)= 0 otherwise
Transmission coefficient=(amplitude of transmited wave)2/(amplitude of incoming wave)2
I am also...
Homework Statement
An electron approaches a potential barrier 10 eV high and 0.5 nm wide. If the electron has a
1% chance of tunnelling through, what must be its energy?
Homework Equations
don't know how to put equations in eg how do i get something like alpha and theta etc...
Homework Statement
V(x) = \inf if x \leq 0
= -V if 0 < x < a
= 0 if x > a
NOTE: E>V
Find the wave functions in each region and the stated phase shift.
Homework Equations
Schrodinger Eq.
Instructions note that wave functions are:
\Psi_I = A\sin{kx}
\Psi_{II} =...
assuming that the electron has an incident energy of 8eV and that the barrier is of height Vo=13eV and width L=5x10-10m calculate the probability that the electron will be able to tunnel through the barrier.Relevant equations= k = (sqrt(2m(V-E)) /h-answer
(sqrt(2x9.1x10-31(13-8)x1.6x10-19)x2pi...