Width Definition and 267 Threads

Hello, I have a slight problem with Quantumtheory here. Homework Statement I have solved the schrödinger equation in the momentum space for a delta potential and also transferred it into real space. So now I have to find the correlation between the width of the wavefunction in both spaces...

Homework Statement Find the de Broglie wavelength for an electron with v=0.001c. Find the angular width of the central bright fringe in a double slit experiment, with the separation of the two slits d=50nm. Homework Equations wavelength = h/mv d sin(theta)=n*wavelength The...

If we take a CW laser,say, and operate a pulsed regime, will this directly effect the spectral content of the emitted light? Is there anyway that we can pulse this laser without introducing linear chirp? Thank you

A laser emitting light with a wavelength of 560 nm is directed at a single slit, producing an interference pattern on a screen that is 3.0 m away. The central maximum is 5.0 cm wide. determine the width of the slit and the distance between adjacent maxima. attempt i used this equation...

I need to know the beam width of a pulsed yag laser (280.5 nm) when focused, assuming its completely guassian. The laser is focused through a bi-convex lens with f=15cm. I've found expressions for w(z), but they are all in terms of the minimum waist, w0, which I don't have and is probably the...

Hey guys, In diffraction of light, why must the slit width be of comparable size to the wavelength of the light being shone on it for diffraction to be noticed most? Thanks

Hi, I realized that I don't know when someone uses this notation 5'x6' which one are they referring to as being the width and which as being the length? What is the standard behind stating things like this for area thanks in advance

Hi. I need your help. What is the Full Width at Half Maximum (FWHM) of this function ( look at the picture) ? http://imageshack.us/photo/my-images/835/immaginezxa.png The operating voltage of a PMT is in the order of 1710V. I've to find the PMT gain. The peak value is near channel 630. The...

" Depletion Layer is the region in diode which consists of ions( formed due to formation of octet configuration )of p-type and n-type dopants" What happens to the ions present in the depletion layer when a diode is biased? why the depletion layer width changes??

Hi Experts, I'm working in industry and have an application requiring some expert knowledge on statistics/probability. I have a probability distribution function (PDF) for a Gaussian random variable. I know the standard deviation of the PDF. I also know total number of experiments conducted...

Hi, all I want to control the power ratio of my series array antenna. I heard there is some relation between width of rectangular patch antenna and power to control the power ratio. I want to know.. Do you know some relation?

Hi I have a problem to solve and I'm stack, so I would really appreciate your help if anyone can tell me how to answer the following question: "Consider a sky imaging system that has a 100m wide FoV measured at 1km from the camera; and that images a passenger airliner at a height of 2km as 10...

Shear stress of bolts Diameter of bolt Shear stress of plate Load carried Bearing stress of plate Bearing stress of bolts If someone could help me it would be fantastic Thanks

Can multilayer PCB have different width and/or length layers to create a "shelf"? I am in need of creating a 4 layer PCB stackup, but I need to have one of the PCB different width and length to create a "shelf" so to speak. Has anyone heard of doing such a thing? My layout software doesn't...

I am new to quantum mechanics so I am just trying to get an understanding of the infinite square well. I have been reading a lot of material and I see a lot of times that the barriers of the well say -L/2 and L/2. I know that outside the well to the left is -infinity and to the right is...

Homework Statement I am required to calculate the width of a single slit. I have known distance, L, between the observation screen and the slit, and photo images were taken of the resulting waveform. However, the wavelength is unknown, therefore making many of the equations I'm attempting to...

Homework Statement Hey all, I'm stuck on some homework and any help would be awesome. this is the question The crane shown in the diagram must carry a load of 600 lbs, at a distance, shown in the figure, of 20 feet from the center of gravity of the crane. If the crane weighs 1,500 lbs...

I am studying to become and electrical engineer and am currently taking Electronics I. I am having trouble understanding the change in the depletion region that results from a bias. I understand that at the time of manufacture the free electrons from the n-type semiconductor are attracted to the...

Hey! I have some dumb-smart question Does 1D line have physical width? My logic says that mathematically you can go smaller and smaller,but I see there being a problem with 1D having infinitly small width in physics. If 2D object has infinitly many 1D lines that would suggest that 2D...

1. Jean camps beside a wide river and wonders how wide it is. She spots a large rock on the bank directly across from her. She then walks upstream until she judges that the angle between her and the rock, which she can still see clearly, is now at an angle of 30 downstream (as shown in the...

Actually i m new to electrical sciences, can anyone please explain me the working principle of a PWM?? and its applications , please provide any relevant links concerning it. Thanks in advance

Homework Statement Single-slit diffraction can be observed with any type of electromagnetic wave (not just light). Suppose you want to make a diffraction slit whose width is seven times larger than the wavelength for the following cases. How wide would the slit be? (a) A radio wave for...

Homework Statement Using only the information above (previous problem), what is the line width of the spectral line representing the 5 to 2 transition in H (hydrogen) Homework Equations Given Data: lifetime of n = 5 is 7.52ns lifetime of n = 2 is 1.38ns Thus, total t...

Homework Statement Use NaXpo=NdXno Xpo=\sqrt{(2\epsilon\phi/qNa)(Nd/(Nd+Na)} Xno=\sqrt{(2\epsilon\phi/qNd)(Na/(Nd+Na)} to prove Xdo=Xdo+Xno=\sqrt{(2\epsilon\phi/q)((1/Nd)+(1/Na))} Homework Equations (1/Na)+(1/Nd)= (Na+Nd)/(Na)(Nd) The Attempt at a Solution I get stuck at...

Hello! I'm very new to MATLAB and came across a problem: I need on the X axis values from 1 to 1024, only the powers of 2. I managed to get MATLAB to show only these values but as they would be when all the values are shown (1 and 2 are one ever the other and 512 and 1024 are far away one from...

Homework Statement A ruby laser emits light of wavelength 694.3 nm. If this light is due to the transition from n=2 to n=1 state of the electron in a box, what is the width of the box? Homework Equations K=2pi/Lambda kL=npi The Attempt at a Solution Thinkin about the problem, i...

Homework Statement I'm trying to write up my physics lab but i don't know how to calculate the spectral band width. Homework Equations The Attempt at a Solution I measured a coherence length for green light (546.1nm) to be 0.122mm. How do I calculate band width from this...

Hello Everyone, I am working on a system for an undergraduate project that uses pulse width modulation to power two electromagnetic clutches. I have a pic microcontroller that is supplying a PWM signal to a MOSFET that is in turn switching the ground side of my clutches. Everything seems...

So when thinking of a photon, we (at least I do) think of the picture, where is it shown as having literal height and width, but I know or at least I think I know, that the lines just represent the intensity/ strength of the E and M part of the wave, not the actual shape of the photon. And it...

it seems like looking at beam patterns from directional RF antennas the beamwidith is something like inversely proportional to the parabolic reflector diameter. why can you make an almost perfect strait parallel beam of light but not with RF?

Dear All, I am making a MIDI Drum project. I want to convert the pressure sensed by piezo into pulse width with presetable setting to shift the offset level above which the output pulse will be generated. If you have any other idea to convert pressure to pulse width kindly let me know...

Hi, can anyone explain how to tune the pulse width of excimer laser? Thanks Baris

Homework Statement Microwaves of wavelength 2.80 cm fall on a slit and the central maximum at a distance of 1.0 m from the slit is found to have a half-width (i. e. distance from middle of central maximum to first minimum) of 0.67 m. Find the width of the slit.

I have looked for a definition of 'decay width' on the internet and could only find articles that use the term, no definition. I first saw the term on a periodic table of elements showing information about different radioactive isotopes and their decay modes. Is 'resonance width' a synonym...

Homework Statement What is the maximum slit width so that no visible light exhibits a diffraction minimum?(Visible light has wavelengths from 400 nm to 750 nm.) Homework Equations D*sin(theta)=m*lambda ; where D = slit width,theta in degrees, m =1,2,3,..., and lambda is wavelength...

Homework Statement Young's fringes, produced by monochromatic laser light passing through slits 0.60mm apart, are viewed on a screen. The distance accrose 20 fringe spacings on the screen is 58mm. When the screen is moved 0.80m away from the slits, the distance across 20 fringe spacings...

Homework Statement Young's fringes, produced by monochromatic laser light passing through slits 0.60mm apart, are viewed on a screen. The distance accrose 20 fringe spacings on the screen is 58mm. When the screen is moved 0.80m away from the slits, the distance across 20 fringe spacings...

Hello-- I've been working with a time-domain function to calculate the Ricker (Mexican Hat) wavelet for -0.2 \leq t \leq 0.2 . This function is given as s(t): s(t) = \left( 1 - \frac{1}{2} \omega_0^2 t^2 \right) \mbox{exp} \left ( -\frac{1}{4} \omega_0^2 t^2 \right ) In the...

Homework Statement In a double-slit experiment, the two narrow slits are spaced 0.20 mm apart. A viewing screen is put 1.2 m behind the slits. A parallel light ray is shining on the slits. (a) If the wavelength of the incoming light ray is 633 nm. What is the width of the central bright...

Hey people, I am trying to write my own histogram making code since the Excel one sucks IMO. I am having some trouble thinking the whole bin 'width' thing through though. I plan on using the formula number of bins = k = 1.87(N - 1)0.40 + 1 Then I was going to figure out the bin...

Homework Statement I need to express the full width at half maximum Δω as an expression in terms of τ. Homework Equations I'm guessing that the expression of Δω will fulfill this task. The Attempt at a Solution The problem is I have no idea how to go about the calculations :|

Homework Statement A prince trapped in a castle wraps a message around a rock and throws it from the top wall with an initial velocity of 12 m/s [42 deg above the horizontal] the rock lands just on the far side of the castles moat at a level 9.5m below the initial level. determine the rocks...

Consider a two-level system, let T1 be the relaxation time for the excited system and T2 is the relaxation time for coherence. If we use a Gaussian (with small constant waist w) exp(-x^2/w^2) to shine on the sample, because the waist is small, propably only the atoms around x=0 will be excited...

I am wondering... say an object was put directly on a lens and you wanted the projected image to focus at around 3 cm on the other side. How do you determine how wide the lens has to be? (please see attachment)

Ive been marked wrong but not sure why: The distance between the first and fifth minima of a single-slit diffraction pattern is 0.400 mm with the screen 41.0 cm away from the slit, when light of wavelength 570 nm is used. Find the slit width. y=m(theata)D/a m-order = 5 D-distance...

Homework Statement When a hydrogen atom undergoes a transition from the n=2 state to the n=1 level, a photon with \lambda=122nm is emitted. a)If the atom is modeled as an electron in a one-dimensional box, what is the width of the box in order for the n=2 to n=1 transition to correspond...

[b]1. When blue light of wavelength 450 nm falls on a single slit, the first dark bands on either side of center are separated by 51.5°. Determine the width of the slit. [b]2. sin\theta=\lambda/w [b]3. w=450e-9/sin(51.5)=5.75x10-7 I tried this but it said it was wrong, if...

When measuring the fringe width of a superposition pattern from a monochromatic source - I am using a laser. What problems/inaccuracies could I have when measuring it?

Homework Statement Find the tributary load width. Homework Equations - The Attempt at a Solution Hi, I'm having trouble understanding the concept of the tributary load width. Can someone help me out with this. Attatched is the frame that we need to find the Tributary load...

Homework Statement What is the slit width? Wavelength is 635 nm. Distance between screen and slit, 2.5 m. Distance on screen between first and second minima above the central maxima is delta 6 mm. Homework Equations D* sin theta * = m * lambda tan theta = x/ distance between screen...