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. N

    Analytic expession for the width of a wavelet

    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...
  2. X

    Width of the first dark fringe (2 slit interference)

    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...
  3. I

    Project wk:calculate width of spectral line

    Homework Statement for my solar rotation prodject i am observing the sodium doublet and seeing how much it shifts from either side of the sun to calculate the rotating speed i need to calculate the predicted width of one of the sodium lines, I've tried to find the width to the minima's...
  4. Saladsamurai

    Excel Histogram How does it calculate bin width

    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...
  5. K

    Expressing the full width at half maximum Δω by τ

    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 :|
  6. J

    How Do You Calculate Angular Dimensions in Astronomy Photography?

    Homework Statement From my astronomy textbook: "The photograph that opens this chapter was taken next to the Gemini North Observatory atop Mauna Kea in in Hawaii. The telescope is at longitude 155 28' 09" west and latitude 19 49' 26" north. a) By making measurements on the photograph, find...
  7. L

    Calculating a Prince's Message: Flight Time, Moat Width and Impact Velocity

    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...
  8. K

    Relaxation time and spatial width

    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...
  9. C

    How to determine a lens width?

    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)
  10. M

    Find Single slit diffraction width

    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...
  11. D

    Calculating Width of One-Dimensional Box for Photon Emission

    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...
  12. M

    Finding the width of a slit

    [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...
  13. O

    Young's Double Slit - Fringe Width

    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?
  14. N

    What is the Tributary Load width

    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...
  15. J

    Energy width of ground state neutral pion

    Homework Statement Most of the particles known in physics are unstable. For example, the lifetime of the neutral pion, \pi^{0}, is about 1.0 x 10^{-16} s. Its mass is 1.35 x 10^{8} \frac{eV}{c^{2}}. What is the energy width of the \pi^{0} in its ground state.Homework Equations \Delta E\Delta...
  16. U

    Calculating slit width by length difference of 1st and 2nd minima

    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...
  17. R

    Width of a Wigner-Seitz cell

    Homework Statement Treating Sodium (Na, bcc, a= 4.23 Angstrom) as a free electron metal with a single valence electron per atom, calc. the Fermi wave vector and compare with the distance to the Brillouine zone boundary closest to the origin. The Attempt at a Solution I have obtained...
  18. N

    Pulse Width of a Magnetic Field

    Hello, new kid on the block here. I have read the rules and hereby present my question. My aim is to calculate the period of a transient DC magnetic field from a half sine wave magnetiser output into an air core wirewound coil. Coil Resistance : 14.66 mili ohms (derived using voltage drop...
  19. J

    Width of Finite Potential Well

    For an electron in a certain rectangular well with a depth of 20.0 eV, the lowest energy level lies 3.00 eV above the bottom of the well. Find the width of this well. Hint: Use tan theta = sin theta/cos theta. Equation for energy levels in a rectangular well...
  20. F

    Axion Decay Width: Mass 10^-6 eV, Primakoff Effect

    hello I would like to know the frequency width of a decaying axion Lets say the axion has a mass of 10^-6 eV and it decays via the primakoff effect within a B field into one photon. Because there is only one photon in the final state I would assume that the photon frequency is quite narrow but...
  21. C

    Relation between decay rate (lifetime) and spectral width

    Hi, I am trying to understand exactly how and why the lifetime, or decay rate, of an atomic level determines the spectral width of the transition to this level. Also I would like to understand why the natural lineshape is a Lorentzian. I am familiar with the vague explanations involving...
  22. M

    Calculating Single Slit Diffraction Width with 630 nm Light

    Homework Statement A single slit is illuminated with 630 nm light, and the resulting diffraction pattern is viewed on a screen 2.8 m away. If the linear distance between the first and second dark fringes of the pattern is 12 cm, what is the width of the slit? Homework Equations y=Ltan\theta W =...
  23. X

    Finding Central Maximum Width for Laser

    Homework Statement A laser 632.8nm is sent through a single slit of widith 0.30 mm. Wats the width of the central maximum on a screen 1.0m in the back of the slit? Homework Equations asin(theta) = m lamda The Attempt at a Solution lamda: 632.8nm 0.30 mm= 3.0 x 10^-4 m...
  24. K

    Statistics: Width of a Confidence Interval

    Homework Statement http://www.geocities.com/asdfasdf23135/stat15.JPG I am OK with part a, but I am having some troubles with part b. Homework Equations Width of a Confidence Interval The Attempt at a Solution Attempt for part b: http://www.geocities.com/asdfasdf23135/stat16.JPG...
  25. P

    Calculating Width of Single Slit Diffraction Pattern

    Homework Statement The central bright fringe in a single slit diffraction pattern from light of wavelength 412 nm is 1.9 cm wide on a screen that is 1.05 m from the slit. How wide is the slit? Homework Equations i keep trying the equation .5asintheta=.5wavelength I can't seem to...
  26. K

    Pulse laser and spectral width help

    A pulse 300ns long is made using a continuous wave laser and a very(very) fast shutter. What is (approx.) the minimum spectral width of the pulse? I have no idea where to start. For starters what is the spectral width? and how would i go about solving this problem. Not looking for a...
  27. E

    Emission line width and the uncertainty principle

    Hey what's the relationship between the width of emission lines and the uncertainty principle? My lecturer mentioned it briefly but didn't go into it. I think I get it but would have trouble explaining it. Cheers, nSlavingBlair
  28. T

    Double Slit Interference (nonzero slit width)

    Homework Statement A mask with 2 slits is illuminated by a light of 589nm wavelength. Slits each have a 0.1mm width separated (centre to centre) by 3.0mm. Calculate the distance between adjacent bright fringes on the screen if a screen is placed 5.0m away from the slits. Homework...
  29. M

    Calculating Minimum Width for 5 Interference Maxima

    Homework Statement Ramon has a coherent light source with wavelength 554 nm. He wishes to send light through a double slit with slit separation of 1.5 mm to a screen 90 cm away. What is the minimum width of the screen if Ramon wants to display five interference maxima? Homework...
  30. S

    Creating a Pulse Width Modulator Circuit

    We have been asked to make any circuit of our choice using op-amps on a breadboard or a PCB. We have found this circuit of PULSE WIDTH MODULATOR on the net and we have decided to go for it.But our teacher wants us to explain the designing of the circuit too namely why have we used the resiistors...
  31. H

    Calculating Width of Metal Sheet for Corrugated Roofing Panels

    Homework Statement "A manufacturer of corrugated metal wants to produce metal roofing panels that are 28 in. wide and 2 in. thick by processing flat metal sheets." the illustration shows that by "2 in. thick" they are referring to the distance between the crest and valley of the sine wave...
  32. A

    What is the width of a wall seen from an opposing mirror?

    Homework Statement In a church choir loft, two parallel walls are 4.98 m apart. The singers stand against the north wall. The organist faces the south wall, sitting 0.967 m away from it. So that she can see the choir, a flat mirror 0.855 m wide is mounted in the south wall, straight in front...
  33. L

    What is the name to refer to the width of one graphic function

    Hi, I want to know the technical name of the width of a graphic funcion. In the example I give at the bottom, the width of the function is painted by an arrow. Maybe the noun is amplitude? http://img528.imageshack.us/img528/8905/graphfh8.png Thanks with anticipation
  34. B

    How can I measure black line width using a robot and QRB1134 sensor?

    Hi, I would like to measure black line width (width of 0.5 inch)with a robot. I don't know how to do it. I use a QRB1134 sensor and the Analog/digital converter. please can someone guide me on the procedure for this please? C.
  35. J

    Width measurements and conversions

    Homework Statement a. How wide is the gap between tiles in centimeters? b. How wide is the gap in inches c. How many algae-thicknesses is the gap between tiles Homework Equations The Attempt at a Solution First off, I just want to know if I did a and b correctly. To set up...
  36. J

    How to Calculate surface width of a 3d object intersected at an angle?

    I'm looking for a formula that will give me the surface length of a 3d object when intersected at a specific angle? For example if 1" wide object which is 14" long is at 90 degrees (i.e. vertical) to a line, it will be 1" wide when sitting on the line. It will be 14" wide when it is parallel...
  37. D

    One-dimensional box of some width with a particle inside

    Okay, so let's say we have a one-dimensional box of some width with a particle inside. If the particle is in an eigenstate of the energy, we know its energy exactly. Since the energy is purely kinetic, we also know its momentum. By the uncertainty principle, the position should be infinitely...
  38. T

    Exploring Particle Decay Width Dependencies

    Is there a general dependence of some physical quantities for the decay width of any particles?
  39. rocomath

    Solving a Parabola: Finding the Width at a Given Height

    HINT! Parabola An arch is in the shape of a parabola with a vertical axis. The arch is 15 ft high at the center and the 40 ft wide at the base. At which height above the base is the width 20 ft? V(0,15) so my equation becomes: (x-0)^2=-4p(y-15)\rightarrow x^2=-4p(y-15) F(0,15-p) &...
  40. P

    Calculate the width of the gutter where the depth is 6cms

    Homework Statement The cross-section of a gutter can be represented by the quadratic: y=4/11x^2-4x+11 where x and y are measurements in cm. Calculate the width of the gutter where the depth is 6cms. Homework Equations The Attempt at a Solution my answer was 1.26cm or 12.6mm but...
  41. B

    How Do You Calculate the Width of a Slit in a Diffraction Experiment?

    Width of Slit...HeLP on setup Please! Homework Statement A helium-neon laser (λ=590 nm) illuminates a single slit and is observed on a screen 1.7 m behind the slit. The distance between the first and second minima in the diffraction pattern is 6.78 mm. What is the width (in mm) of the slit...
  42. B

    What is the width of the aperture?

    [SOLVED] Width of Aperture...please help! 1. Homework Statement A point source of light illuminates an aperture 2.3 m away. A 10.2-cm-wide bright patch of light appears on a screen 1.02 m behind the aperture. How wide is the aperture? 2. Homework Equations 3. The Attempt at a...
  43. B

    Solve Width of Aperture: Find Width Now!

    Width of Aperture...please help! Homework Statement A point source of light illuminates an aperture 2.3 m away. A 10.2-cm-wide bright patch of light appears on a screen 1.02 m behind the aperture. How wide is the aperture? Homework Equations The Attempt at a Solution I can't...
  44. S

    What Is the Optimal Slit Width for a Visible Light Spectrometer?

    Homework Statement A visible light spectrometer has a grating of width D=10cm and a collimating lens of focal length L=1m. Show that the optimal width for the input slit is such that it will produce a diffraction pattern of width D. Homework Equations The diffraction pattern of a single...
  45. N

    Einstein solid and the width of Gaussians

    Homework Statement If I have two Einstein solids A and B with oscillators N_A N_B and they share a total of 20 energy units. I want to find the width of the function that describes the multiplicity for this system. How do I find this? - I have an expression in my book (Thermal Physics by...
  46. N

    Width of central maximum in a single slit diffraction pattern

    hi everybody. I have a problem in finding the width of central maximum in a single slit diffraction pattern. theoritically, we say it is the distance between the two first minima on either sides of the central maxima. i feel this calculation leads to the width of central maxima+half minima on...
  47. malawi_glenn

    True width of J/psi particle

    Hi! I have been reading a bit about the J/psi resonance, and I was wondering about this thing: Its true width is relative very small, and all the diagrams I've seen are experimental and they state that the widht in the graph is not the true, but arises due to decetor resolution. I was...
  48. M

    Spectral line width calculations

    So I'm in an intro quantum physics course, and while I'm sure this is a really simple problem, I'm just not getting the math to work out here. Say you excite the atoms of some gas such that they emit light at a wavelength of 5500 angstroms as they fall back to the ground state. Now if the...
  49. A

    Exploring Hookes Law: Impact of Width on Elasticity

    Hiya, I have had to do an investigation on hookes law as part of my primary school teaching course. i am by far not the best at understanding physics. Can someone please explain to me what effect the width of a piece of elastic has on its elasticity and why? thanks
  50. P

    Understanding the Width of Distribution for Error Analysis

    Hello! I know this is going to sound like a very basic question, but I'm working on a report about error analysis and I was wondering what width of distribution is.
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