What is Width: Definition and 288 Discussions

Length is a measure of distance. In the International System of Quantities, length is a quantity with dimension distance. In most systems of measurement a base unit for length is chosen, from which all other units are derived. In the International System of Units (SI) system the base unit for length is the metre.
Length is commonly understood to mean the most extended dimension of a fixed object. However, this is not always the case and may depend on the position the object is in.
Various terms for the length of a fixed object are used, and these include height, which is vertical length or vertical extent, and width, breadth or depth. Height is used when there is a base from which vertical measurements can be taken. Width or breadth usually refer to a shorter dimension when length is the longest one. Depth is used for the third dimension of a three dimensional object.Length is the measure of one spatial dimension, whereas area is a measure of two dimensions (length squared) and volume is a measure of three dimensions (length cubed).

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  1. S

    Transistor drain currents and changing width & length sizes

    Hello. I have been running some simulations on CMOS inverters. When I change the channel dimensions, I noticed something interesting with the drain current -- the smaller the channel dimensions (say around 3μm x 3μm) the simulated drain current is very close to the predicted theory drain...
  2. K

    Effect of Doping Levels on Width of Depletion Region

    Homework Statement The problem is what would be the effect on the width of the depletion region of an unbiased PN junction on the doping levels of the P and N sides Homework Equations This is a conceptual question. There is no equation involved. The Attempt at a Solution Increase...
  3. S

    Investigating the effects of changing the length and width of transistor channel

    Hello, I posted this here because it is for a bit of course work, but I am just looking to confirm if I am using the right equation. I hope this is ok! If not, sorry! I just didn't think since I was asking a specific assignment question, I would post here. I need to investiage how changing...
  4. N

    Trig Problem - Finding the width of a river

    [b]1. An observer is next to a river and wants to calculate the distance across the river. He measures the angle between his observations of two points on the shore, one on his side and one on the other side, the angle coming out to be 28º. The distance between him and the point that is on the...
  5. C

    Chromatography - How does flow rate affect peak width?

    Today in a lecture on chromatography the lecturer gave an explanation which seems pure ******** to me. The example she used was a handful of solutes, each taking a different path through the stationary phase, obviously some paths will be longer than others and thus each solute will have a...
  6. G

    Schrödinger's equation and line width

    is the spectral linewidth something that is only explained by the uncertainty principle or do you also get this from schrödinger's equation? cause i would say, that schrödinger gives us discrete energy levels if we talk about atoms and therefore there should appear no linewidth. or do i need...
  7. O

    Young Double Slits Experiment: Investigating Fringe Width

    hey guys, i want to to know why the fringe width in young double slits experiment is λ thx
  8. B

    Comparison of width of a wavefunction in real space and momentum space

    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...
  9. V

    Calculating de Broglie Wavelength & Double-Slit Fringe Width

    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...
  10. N

    Spectral width of an optical pulse

    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
  11. F

    Width of slit and distance between adjacent maxima

    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...
  12. Y

    Angular Resolution / Beam Width

    Hello all, In terms of Radio Astronomy, can someone please explain to me the difference between the Beam Width and the Angular Resolution? I have a 1.2m dish to play about with, and I wanted to know what it could resolve. I thought I was sorted by using the diffraction formula, but then I...
  13. J

    Laser focusing, minimum beam width

    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...
  14. N

    Diffraction - Why must slit width be comparable to the wavelength of light?

    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
  15. G

    Area - 5'x6' which is the width and which is the length?

    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
  16. Hepth

    3D Integral to 4D integral in Width Calculation

    While this is more a mathematics problem, it really belongs here for those theorists who have experience with QFT calculations. This is sort of a generic question, but can I turn a 1->3 decay width integral into a single 4-D integral over one of the momenta. Such as: \Gamma = \frac{1}{2...
  17. V

    What is the FWHM and fitting curve for the distribution in this figure?

    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...
  18. H

    Doubt on Depletion Layer Width in Biased pn-Jnction

    " 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??
  19. T

    Calculating Width of Gaussian PDF(x) Given Sigma & N

    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...
  20. E

    What is the relation between width and power of rect patch antenna?

    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?
  21. M

    Size estimation of CCD and ideal width of pointspread function

    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...
  22. N

    Calculating Densities and Width of Depletion Region in Ge

    Homework Statement a. The densities of electrons and holes required for the Fermi levels in both the p- and n-type Ge to enter the bands. That is, in n-type Ge the Fermi level coincides with the bottom of the conduction band and for p-type Ge the Fermi level coincides with the top of the...
  23. E

    How would you calculate plate thickness and width when you know

    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
  24. K

    Width of diffraction grating

    How wide would the grating have to be for the two emission lines to be observably resolved? What is the m (order of diffraction peak) that is minimum to resolve these lines to be observed??R= Nm= wavelength/change in wavelength w= Nd i know that w=Nd w= (x) (2.5 * 10^-6 m) i...
  25. Z

    Can Multilayer PCBs Create a "Shelf"?

    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...
  26. M

    What is the significance of the infinite square well width in quantum mechanics?

    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...
  27. M

    Diffraction - Calculating Width of a Slit

    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...
  28. G

    How to calculate a width of a crane, so it won't tip over

    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...
  29. S

    Understanding the width of the depletion region in a p-n junction

    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...
  30. T

    Does 1D Line Have Physical Width? Exploring the Concept

    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...
  31. M

    River Width Estimation Problem

    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...
  32. A

    Pulse Width Modulation Explained - Relevant Links Included

    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
  33. T

    Finding the width of a diffraction slit

    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...
  34. D

    Finding The Spectral Line Width

    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...
  35. C

    Space Charge width proof using Algebra

    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...
  36. G

    MATLAB How to change the width between values on an axis in matlab?

    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...
  37. T

    Calculating the width of the box for a particle in a box

    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...
  38. A

    Calculating Spectral Band Width for Green and Sodium Light

    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...
  39. T

    Pulse Width Modulation (MOSFET Question)

    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...
  40. E

    Does a photon have a width and height ?

    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...
  41. N

    Calculating Spectral Width: Min Freq, Wavelengths & Regions

    Homework Statement In 1985, the record for the shortest event ever created was a laser pulse about 10 femtoseconds (10‐14 s) long, but recently scientists have generated pulses of light 100 attoseconds (10‐16 s) long. Compute the minimum spectral widths of these pulses. The actual pulse...
  42. C

    RF beam width and antenna diameter?

    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?
  43. D

    MIDI drum pressure to pulse width

    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...
  44. B

    How to tune pulse width of excimer laser?

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

    Calculating Slit Width Using Microwave Wavelength

    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.
  46. S

    Calculating Decay Widths & Estimating Partial Width of τ− Lepton

    i was'nt sure whether to put this here in the homework questions because this is'nt really homework as its for my understanding... However my particle physics exam is tommoro and I'm having some problems understanding how to calculate decay width's of decays. i have the following from a past...
  47. L

    Help: Definition: 'decay width' for isotopes

    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...
  48. D

    Maximum Slit width diffraction minima

    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...
  49. A

    Calculating the Fringe Width without the value of its 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...
  50. A

    How do you calculate finge width without the 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...
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