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. K

    Single slit diffraction bright fringe's width

    According to my knowledge, the position of the dark fringes is given by asin(x)=m*lamda (sorry, I do not know how to type equations in here) tan(x)=d/L a=slit width x=angle of diffraction(?) m=no. of order d=distance from the central fringe L=distance between...
  2. S

    Expressing Area as a Function of Width

    1. How should -2(125)^2 be calculated? *The title is inaccurate, sorry i changed my question.*
  3. M

    Calculating the Thickness of a Doped Silicon Strip with Given Current and Width

    Homework Statement A strip of doped silicon 270 µm wide contains 9.1E22 conduction electrons per cubic meter and an insignificant number of holes. When the strip carries a current of 110 µA, the drift speed of the electrons is 44 cm/s. What is the thickness of the strip? Homework...
  4. J

    What is the best IC for programmable pulse width control with a wide range?

    Hello All, I'm looking for a nifty chip that I can use to pro grammatically set the pulse width of a square wave signal in my circuit. The pulse width range I'm looking for is anywhere between 10 ns and 500 ns and so far, the only thing I have found is the DS1014 series ICs. They have the...
  5. B

    No width contraction in Michelson Morley Experiment, why?

    Based on the Michelson Morley experiment, Lorentz proposed already length contraction as an explanation of the negative outcome of the experiment. a) Did he also propose time dilation? b) How is width contraction ruled out: is that a necessary conclusion of the Michelson Morley experiment or...
  6. R

    Spectral line width problemo

    anyone know how to find the spectral line width given the wavelength of the ejected photon, the energy values for the atom (usual hydrogen e values) and the lifetime in the excited state. any help much appriciated!# cheers all rob
  7. P

    Finding the Total Width of an Ellipse

    How do you find the total width of the ellipse given by the equation 7x^2 + 7(y-6)^2 = 6.
  8. M

    What is the ratio of the largest slit width to the smallest?

    I'm not exactly sure how to get started on this one. Can anybody help me?...Please? Two different single slits are used in an experiment involving one source of monochromatic light. With slit 1 in place, the first dark fringe is observed at an angle of 45 degrees. With slit 2, the first...
  9. I

    Understanding 95% Confidence Interval & Total Width <2.0

    [Solved]Is a stats question,just need some clarity on it-"total width of less than 2. Homework Statement Hi.The result of a memory test is known to be normally distributed with mean mew and standard deviation 1.0. It's required to have a 95% confidence interval for mew with a total width of...
  10. Y

    A third dimensional object has length, width and height

    A third dimensional object has length, width and height. Taking a cross-section of this object anywhere along one dimension results in a two dimensional object, i.e. a line segment with length and width. A two dimensional object has length and width. Taking a cross section of this object...
  11. S

    Effect of Increasing Wire Width on Resistance

    What is the effect of increasing the width of a wire on it's resistance, and why? Thanks Neil
  12. R

    Angular Width of Electromagnetic Waves emerging from two buildings

    Homework Statement Hello everyone, I have one more problem left of my homework and I seemed to be stumped. I don't even know where to begin with this problem, which comes from the section of my book labeled Single-Slit Diffraction. Anyways, here is how the problem reads: Problem 22.18...
  13. S

    Calculating Number of Fringes with Wavelength and Slit Width

    1. How many dark fringes will be produced on either side of the central maximum if light ( = 553 nm) is incident on a single slit that is 5.1 10-6 m wide? 2. sin theta = m (lamba/ W) lamba = wavelength W = slit width m - number of fringes 3. I have no idea how to do this...
  14. B

    Eta Prime Meson: Narrow Decay Width & Conservation Rules

    Why does the eta prime meson have such a narrow decay width (ie long lifetime) compared to the rho and omega mesons? Is there some conservation rule that supresses its decays?
  15. A

    Alternating current about resonance width

    Since the question quite long and contains many formulas, so i take a photo instead. my question is that for part b since Z= \sqrt{R^2+(X_L-X_C)^2} can i subst X_L = (W_0+\triangle{\omega})L and X_C = \frac{1}{(w_0+\triangle{\omega})L} into the Z= \sqrt{R^2+(X_L-X_C)^2}...
  16. P

    Interference using a reflection grating: how to determine the slit width?

    Hello! I'm working on a surface analysis of a silicon-microstrip-detector. That is basically a silicon wafer with p- and n- doped strips on it. They are periodically produced on the crystal. Therefore I can use it as a diffraction grating for visible light to do my surface analysis. My light...
  17. S

    What is the relationship between Q factor and spectral emmision line width?

    I have no ideal where to begin on this question. Light of wavelength 0.6x10^-6 meters is emmited by an electron in an atom behaving as a lightly damped SHM with a Q factor of 5x10^7. Determine the width of the spectral emmision line. I am thinking E=hv=A^2 where A^2=Q^2 for large Q...
  18. D

    Tyre Width & Grip: Why Performance Cars Have Wider Tyres

    This may be a bit of a silly question and I'm not too sure if I've posted it in the right place, But I'm a bit confused and need something cleared up. In physics/maths classes I've always read/been told that friction is not a function of contact area and only that of force. Now I'm going to...
  19. Amith2006

    Interference in Liquid: Fringe Width Change?

    # A Fresnel biprism arrangement used to study interference in air is immersed completely in a liquid. Will the fringe width increase, decrease or remain unchanged?
  20. W

    What is the angular width of the central maximum?

    A single slit of width 1.50 um is illuminated with light of wavelenth 500.0 nm. What is the angualar width of the central maximum?
  21. G01

    Width of Pinhole Camera Aperture for 12cm Spot Light

    A point source of light 2.0m away from the a pinhole camera creats a 12cm wide spot of light on the screen 1.0 deep inside the camera. How wide is the aperture of the camera. I thought this was a magnification problem, so I set up the equation: h_i = .12m, h_o = x, s_i = 1m, s_o = 2.0m...
  22. E

    Mass width in the propagator?

    When calulating near resonant cross sections one usually inserts a mass width in the denominator of the propagator. This should, at least as I have understood it, correspond to taking the higher order diagrams into account. What I would like to see is a proof for the equivalence between...
  23. R

    Pixel Density & Component Accuracy: Does Width Matter?

    The following question appeared on one of my exam papers. A CCD of pixel density 10Mpixel (1cm^-2) is used to image a component of length 10cm. Show how this does or does not meet the required accuracies of +/- 0.025mm. A similar question was asked in a previous exam where the...
  24. T

    Qm, infinite sq well doubles in width

    Qm, infinite sq well doubles in width (reposted more clearly) Edit: posting a little clearer. I was asleep when I did this last time I don't have any notes and have to sit an exam tomorrow so i would appreciate a little help understanding this. I have the answers so i don't need them just a...
  25. O

    Find the Ideal Width for a Rectangular Vegetable Garden

    Hi again! :smile: A gardener has a rectangular vegetable garden which is 30m long and 12m wide. He traces to alleys x meters wide, similar to this: _____________________ |________| x |________| x___________ _________ |________| x |________| Determine, with x, the area occupied by...
  26. P

    Diffraction by single slit - effect of increasing the slit width

    For diffraction by a single slit, what is the effect of increasing (a) the slit width, and (b) the wavelength? It was a problem on my daughter's final and I never seemed to be able to answer it for her. :confused:
  27. F

    Finding particle data on the higgs resonance width?

    Greetings--I'm looking for data on estimates for the Higgs resonance width and I'm not quite sure where to look. I've checked the "Review of Particle Properties" and the Particle Data Group website, but I couldn't find an estimate for the higgs width. Any suggestions? Thanks, Flip
  28. M

    What is the optimal width for shelves in a curved-wall closet?

    Hi, I've been trying to work this problem that someone needs for a closet project. I tried to get some help in the general math forum, but that didn't work. Hopefully I'm targeting the right group now :) Basically we're trying to build custom (cut to fit) shelves in a walk-in closet. There's...
  29. I

    How Wide is the Potential Well When an Electron Emits a Photon?

    hey guys i am kinda stumped on this problem, if anyone can give me a helping hand, it's be much appreciated, thanks! An electron is trapped in a one-dimensional infinite potential of width L. As the electron falls from the n=3 to the n=2 eigenstate, it emits a photon with a wavelength of...
  30. J

    Calculating Slit Width for Diffraction Pattern

    A diffraction pattern is produced on a screen 140 cm from a single slit using monochromatic light of wavelength 500 nm. The distance from the center of the central maximum to the first order maximum is 3 mm. Calculate the slit width (assume first order maximum is halfway between the first and...
  31. P

    Calculating Angular Width of Central Maximum in Wave Diffraction

    Waves with wavelength 2m pass through a hole in a barrier 10m wide. Compute the angular width of the central maximum. I'm not sure what I am finding here. Is it the angel between the central maximum and the 1st nodal line?...If so am I treating this like a 2 point source problem? Any help...
  32. K

    Echo-based Valley Width Calculation - Knowing the Speed of Sound

    Need some help with this question. I think I know how to do it but I don't know the speed of sound. Could someone let me know what it is? A rifle is fired in a valley with parallel vertical walls. The echo from one wall is heard 6.0 s after the rifle was fired. The echo from the other wall is...
  33. tandoorichicken

    Diameter of Human Muscle Fiber - Bicep

    On average, what is the diameter of a human muscle fiber (say, a bicep muscle)?
  34. A

    Natural line width and energy uncertainty question

    Lets take an electron which is "in orbit" around the nucleus. As far as I know, its (ANY conceivable) wavefunction can be represented as a superposition of energy eigenfunctions, which correspond to the discrete eigenvalues of the electron's enrergy. What I do not understand is where the natural...
  35. P

    What is the estimated width of stearic acid molecules in water?

    Hi, can anyone tell me how to estimate width of one stearic acid when it is in water. /\/\/\/\/\/\/\/\-COOH <- i want the width going up and down.
  36. H

    Calculating Tunnel Width at Ground Level

    The cross-section of a tunnel is a circular arc. The maximum height of the tunnel is 10 (units). A vertical strut 9 (units) high supports the roof of the tunnel from a point 27 (units) along the ground from the side. Calculate the width of the tunnel at ground level. Please help me solve...
  37. O

    What's the Width of Your Eardrum?

    The size of your eardrum partially determines the upper frequency limit of your audible region, usually between 16,000 Hz and 20,000 Hz. If the wavelength is on the order of twice the diameter of the eardrum and the air temperature is 20 degrees Celcius, how wide is your eardrum? I have no...
  38. K

    How does tyre width affect grip in Formula 1?

    Hi! In a non-related forum I'm trying to convince some people that the amount of dry friction has nothing to do with the size of the contact surface, just the normal force (Fn) and the friction coefficient. In this case it's about formula1, tyre width, wear and grip. I say a wider tyre...
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