Thickness Definition and 328 Threads

I´m trying to find approx. numbers or formulas for a submarine like structure to mantain a constant volume. For a given volume, which materials and to what thickness should the container be?

Homework Statement To reduce reflections from glass lenses (n ≈ 1.5), the glass surfaces are coated with a thin layer of magnesium fluoride (n ≈ 1.39). What is the correct thickness of the coating for green light (510 nm vacuum wavelength)? Homework Equations \lambda = 2nd/(m+1/2)...

Homework Statement Stealth aircraft are designed to not reflect radar, whose wavelength is typically around 3.0 cm, by using an antireflecting coating. Ignoring any change in wavelength in the coating, estimate its thickness. ____cm Homework Equations Well, that's just the issue. I...

I'd like to ask does thinner convex lens give a shorter focal length? If so, why is it? thanks very much~~

I was wondering if anyone could help me with the following question, please: A thin walled pressure vessel is to be used as a pressure accumulator in a number of situations all involving a number of different operation conditions some of which create cyclic stresses. The dimentions of the...

Hi, I'm constructing a waste water tank of 304 stainless steel plate and I'm not sure what thickness the material should be, the tank is approximately 2750mm x 1500mm x 1750mm What would the ideal thickness be for the 304 stainless plate and would there be any specific areas I should focus...

Homework Statement i am trying to work out the required material thickness for a given box. the material i am using is aluminium. i only require the formula - can't find a suitable one on web Homework Equations The Attempt at a Solution M = I σ y M = bd M...

1. A capacitor is formed by 2 parallel plates separated by a dielectric of relative permattivity er = 12, the capacitor plates are 5mm x 10mm. Calculate the thickness of the dielectric required to create a capacitor of 100pF 2. C = eA / d therefore d=eA/C, we have C 100 x 10-9, area of...

1. A conductive sheet of material has a CSA of 10mm x 20mm. Reisistivity of 103 (10 to the 3, 10,000) ohms M. Calculate thickness of the material required to give resistance of 5k ohms 2. Ro = RA/l , where l would be thickness, l = RA/Ro 3. Thickness = 5,000 x 0.2 / 10,000 = o.1m...

How do you calculate the thickness or gauge of a given metal (304 Stainless Steel for example) for a 36" dia. round, vertical cylinder water holding tank? If filled say the tank would be 25-30 feet tall. No physical pressure (pumps or vacuum) on this vessel (vented to atmosphere). Flat...

Homework Statement Given the density of the mantle to be 4700 kg/m^3, the density of the core to be 9700 kg/m^3, the radius of the planet to be 6050 km and the mean density to be 5240 kg/m^3, find the thickness of the mantle. Homework Equations I tried using the formula M = D * V and V...

vacuum vessel / distiller correct wall thickness?? Hello! I have a vacuum vessel / distiller type of vessel with following:- Temperature inside the vessel max. 200°C [Celcius] and a Vacuum at max. -80kPa = -0.8bar Material: SS-304 = Stainless Steel Volume = 0.654m³ My main question...

1) In a double-slit experiment, two parallel slits are illuminated first by light of wavelength 460nm, and then by light of unknown wavelength. The third-order (m = 3) dark fringe resulting from the known wavelength of light falls in the same place on the screen as the second-order (m = 2)...

In XRD, to examine the diffraction pattern and the determine the elemental structure, a thin layer of sample is deposit on a substrate. since x ray penetrate deeper than electron, how the thickness of the sample will affect the XRD result? how do know what is the appropriate thickness to...

Hello all, i need one suggestion for shielding of a gamma source. I have a gamma source with initial activity of 50 mCi=1.85X10^9Bq. What thickness of lead needed to protect myself! I used the formula I(x)=I exp(-kx). I=50mCi; k=37.6 cm^2/g (linear attenuation for 122 keV) and x the thickness...

will thickness of a thin film affect the result of xrd? if too thin, will not get the best result?

Homework Statement A beam of light is split into two coherent beams of intensity I which are in phase. The two beams are sent through different paths and superimposed at the same spot on a screen. A path difference is to be achieved by inserting a glass window of refractive index of 1.7 in the...

Hi I needed to design for a steel plate of S275 steel (275 N/mm2) that will resist a tensile force = 2 x 65 kN = 130 kN. The steel plate must not bend due to this tensile force = 130 kN. And I need to determine the minimum steel plate thickness that will resist the bending (due to the...

In deposition of thin film on a p-type silicon, how to make sure the thickness of the thin film will not affect or affect the least the electrical(Hall Effect) and structural properties? how to know how thick is the thin film that most suitable? can it be calculated? by the way, the thin film...

Homework Statement A hollow spherical shell carries charge density \rho = \frac{k}{r^{2}} in the region a \leq r \leq b. Find the electric field in the three regions: i. r < a ii. a < r < b iii. r > b Homework Equations Surface Area of a sphere Coulombs Law Gauss's Law The...

I am trying to calculate the thickness of the boundary layer for a NACA 2412 airfoil. I am working on constructing some wind tunnel tests that simulate a Cessna 172 (NACA 2412 airfoil). I am trying to determine the thickness of the boundary layer (distance from surface to 99% of free-stream...

Thickness of Quantum Well ?? As I know there are two quantum wells exist. 1. Single Quantum Well 2. Multiple Quantum Well My ques is that : How to find the thickness of a quantum well ? is there any equation to find quantum well thickness ? for single or multiple ? Usually I have look...

Homework Statement What is the thinnest film of MgF2 (n=1.21) on glass that produces a strong reflection for the light with a wavelength of 531 nm? Homework Equations Open-Closed Standing wave Fn= (nv/4L) v = Wave Length * F The Attempt at a Solution Basically, I tried to...

I understand the distinctions of the different types of material strengths, but I get stumped when asked about how they apply when the material discussed is thicker or thinner. Any help?

Hello, You've all probably seen the classic Blasius solution concerning the thickness of a boundary over a flat plate. This problem though assumes that the free stream velocity is constant. http://www.see.ed.ac.uk/~johnc/teaching/fluidmechanics4/2003-04/fluids9/2-dboundary.html I am...

Homework Statement Light of wavelength 547nm is incident perpendicularly on a soap film (n=1.31) suspended in air. What is the smallest nonzero film thickness for which reflected light undergoes constructive interference?Homework Equations 2t = (m + 1/2)(wavelength/nfilm)The Attempt at a...

Hi all, I am doing a paper on the space elevator. On the wikipedia site it states that a climber would be far better off on a stationary cable rather than having a cable pulling the climber since "the cable to be significantly wider at the center than the tips". Why does the center have to be...

1. What do we mean by the carrier number at transparency. I mean, what is carrier transparency of a laser? 2. in an IEEE paper ("Circuit Modeling of Quantum-Well Lasers for Optoelectronic Integrated Circuits (ICs) Including Physical Effect of Deep-Level Traps" IEEE J. Quantum electronics...

Homework Statement A thin film of oil (n = 1.50) floats on water (n = 1.33). If the film appears yellow-green (\lambda = 550 nm) when viewed at normal incidence, how thick is it? Given: n_{f} = 1.50 n_{water} = 1.33 \lambda_{0} = 550 nm \theta_{i} = 0 Required: Thickness (d)...

Homework Statement For a science experiment you need to electroplate a 130 nm thick zinc coating onto both sides of a very thin, 3.0 cm*3.0 cm copper sheet. You know that the charge carriers in the ionic solution are divalent (charge 2e) zinc ions. The density of zinc is 7140 kg/m^3 If the...

Hi All! Im a bit confused regarding the relationship between focal length and the thickness of a lense. In the lab that we performed, my data seems to be skewed and I am unable to decipher the trend. Can someone explainwhat happens to the focal length as the thickness of the lenses...

Homework Statement A transparent film (n = 1.5) is deposited on a glass lens (n = 1.65) to form a nonreflective coating. What is the minimum thickness that would minimize reflection of light with wavelength 500 nm in air? Homework Equations 2nt = mλ n = refractive index of film t =...

Homework Statement What are some different ways to find the thickness of aluminum foil? Homework Equations I have already calculated it by using the method that requires us to find the volume, given the density, and dividing it by area. So i need new ways to do this same problem...

Hello all, Maybe this is a simple question. I've done some calculations like this, but for heating in buildings. Now it's different. I have some crystals I must keep cold, at -25ºC. So I will surround them with an insulation material wall. Outside we have atmosphere temperature I want...

I am working in an Auto Parts manufacturer company which one of its production is DC motors used in different wheicles. I have two type of question about a DC motor : 1: we have a new model DC motors which get too hot. what's the reason? what does the effect of the thickness of cooper wire...

1. Determine the half value thickness, X(1/2) for lead where; I = 0.4 MeV u = 1.59cm^-1 2. using; I = Io e^-ux3. ln(I/Io) = ln(e) -ux ln(2) / -1.59x10^-2 = X(1/2) => X(1/2) = -1.7523m Is that right?

Okay I am not sure if this is going to make sense to you but please work with me. If i had a rectangular frame of t304 stainless steel 90 feet long and 102 inches wide with supports holding it off the ground at each corner and one support on each 90 foot side in the middle, so theyd be 45 feet...

How does the thickness of the capacitor plates affect capacitance when the distance between the plates are comparable to the thickness of the individual plates?

[FONT="Arial Black"][FONT="Arial"][SIZE="5"] Question In flow over a flat plate, how to calculate pressure drop by knowing displacement thickness values at 2 points. Free stream velocity is known.

Homework Statement A Sheet of aluminum(Al) foil has a total area of 1.000ft^2 and a mass of 3.636g. What is the thickness of the foil in millimeters (density of Al=2.699g/cm^3)? Homework Equations d=m/v The Attempt at a Solution 1.347=totally wrong... help please

what are the principles regarding pipe OD, thickness & strength as well regarding round and square which one is more stronger. This matter came up becoz there are certain sizes of OD not available in HR but only available in CR, on the other hand there are certain sizes which we can convert form...

What is the thinnest film of MgF2 (n = 1.39) on glass that produces a strong reflection for light with a wavelength of 680 nm? This is the exact question I am faced with. I didn't really know where to begin so I tried using the ratio of n-air/wavelength to n-film/(new wavelength) to try and...

Homework Statement What is the minimum (non-zero) thickness of a benzene (n = 1.501) thin film that will result in constructive interference when viewed at normal incidence and illuminated with orange light (lamba = 615 nm)? A glass slide (ng = 1.620) supports the thin film answer= 204 nm...

A pair of slits separated by d = 1.30 mm is illuminated with light of l = 610 nm wavelength and falls on a screen L = 2.00 m away. A piece of glass with index of refraction n = 2.2 is placed at one slit. If the maxima shift is Dx/2, and falls on a minimum, what was the minimum glass thickness...

Homework Statement A thin flake of mica (n= 1.58) is used to cover one slit of a double slit interference arrangement. The central point on the viewing screen is now covered by what had been the 9th bright fringe before the mica was used. What is the thickness of mica if light of wavelength...

What is the relationship (generally speaking) between film strength, film thickness, and viscosity: If I polish / superfinish the gear teeth, and bearings on trans, can I go with a lighter viscosity oil, to improve the efficiency of a manual transmission, while still keeping reasonable safety...

Hey guys, The streamlines just outside a boundary layer are pushed away from the wall by the displacement thickness \delta* and I understand that; \delta*=\int^{\infty}_{0}(1-\frac{u}{U})dy Now this is for flow over a plate with length x=4m. At x=0 is the leading edge and at x=4...

I have a question: it is generally stated that 100 micrometers is the acceptable limit on the thickness of the oxidation layer on Zircaloy4 fuel rods. But I'm at loss as what is the reason for this limit ? Is it structural integrity ? Thermal resistance ? Mechanical tolerance ?

Hi, does the thickness of filament affect the brightness of a bulb? So will a thinner filament be brighter than a thicker filament?

1. If the index of refraction of you soap was 1.35, calculate the (minimum) thickness of the film at that part of the film that appears green, given that in air, green light has a wavelength of 535 nm. 2. x = L(lambda/2t) 3. I can't figure out how to derive the equation with n...