Wavelength Definition and 1000 Threads

Homework Statement Light strikes a sodium surface, causing photoelectric emission. The stopping potential for the ejected electrons is 4.6 V, and the work function of sodium is 2.2 eV. What is the wavelength of the incident light?Homework Equations The Attempt at a Solution Problem solved...

Homework Statement What is the de Broglie wavelength of a neutron whose kinetic energy is equal to the average kinetic energy of a gas of neutrons at temperature T = 17 K? Homework Equations lambda = h/p = h/mv. The Attempt at a Solution Well first I tried taking the h =...

[b]1. You perform an experiment with a long column of air and a tuning fork. The column of air is defined by a very long vertical plastic tube with a circular cross section; the upper end of the tube is open to the outside air and the lower end of the tube is filled with water. The column of air...

why sodium has two lines D1 and D2 ?

I did a lab today using this stuff. I need to learn how to find the wavelength of the 1st order of an unknown filament. My data is 600 lines/mm grating Purple line 15 degrees 30 minutes, 15.5 degrees using the equation of d sin (angle) = m (lambda) im supposed to get something like...

Homework Statement Two narrow slits are 0.4 mm apart. The dark fringe of order 5 is 1.2 degrees from the central bright fringe. What is the wavelength of the light in nm? Homework Equations dsin(theta) = (m +1/2)lambda where d = distance between silts m=order lambda = wavelength...

Im attempting a problem in relativistic optics that's asking me to write k_x, k_y and k_z in terms of lambda, c, and theta (theta being the angle between a source and an observer, at rest relative to each other). Lamda is the wavelength in this reference frame. I started off using trigonometry...

Homework Statement I have an issue for a question I have. The problem is that I need to find the distance between the slits of a diffraction grating. Normally this would be pretty simple, but I'm not given the wavelength of the light source we're supposed to use to find it out. Homework...

Homework Statement Earth has the mass 6 · 10^24 kg and the orbit radius r = 1.5 · 10^11 m. (a) Compute its de Broglie wavelength. (b) Apply de Broglie quantization condition as in the case of the Hydrogen atom and compute the quantum number n for the orbit of Earth. (c) What is the...

Homework Statement A narrow beam of collimated white light falls at normal incidence upon a transmission grating with 3150 lines per cm. A spectrum is formed by the grating on a screen 30 cm away. If a 1 cm square hole is cut in the screen its inner edge being 5 cm from the zeroth order...

Homework Statement The diagram attached shows a metal wire stretched between two supports P and T which are 4x apart where PQ=QR=RS=ST=x . Three small pieces of paper are placed at positions Q , R and S . When the wire is vibrated at a certain frequency , the small piece of paper at R...

Why does long wavelength infrared not penetrate glass?

Homework Statement a stationary sound wave has a series of nodes. The distance between the first and the sixth node is 30.0 cm. What is the wavelength of the sound waves? Homework Equations The Attempt at a Solution well no idea about it but in my attempt to solve it, i tried...

I'm trying to reproduce the plot in the attached figure. I know the band-gap energies, so I was hoping there was some simple way I could get the quantum efficiency as a function of wavelength. I read on wiki that Energy(eV) = 1240/wavelength(nm), so I mechanically plugged those in, and got...

How do you find wavelength if your given only the speed?

Homework Statement Find the de Broglie wavelength of an 8 MeV proton. Homework Equations y = h/p where y is the wavelength p = mv K = Eo/sqrt(1-v^2/c^2) where Eo is the rest mass and K is the kinetic energy The Attempt at a Solution I make the assumption that "an 8 MeV proton"...

equals speed? I only ask as I couldn't find a solid answer online.

Homework Statement A small homemade firework goes off 3 meters about the surface of the water where a person is diving. The diver is 10 meters below the surface of the water. (a). How much time passes from the instant the firework goes off until the diver sees it? (b). How much time...

Hi all. Just wondering. Any difference - from the viewpoint of a swimmer - when one swims in water waves of short wavelength as compared to large wavelength? I read about this somewhere before in a newspaper article. The difference will be apparent when the length of the swimmer's body is...

Homework Statement Hello, I'm a little confused. I did an experiment today with a Leslie Cube. One of the faces was a black paint, and another a white paint. I know that white reflects well and has a low emissivity, at least in the visual wavelengths. In the Leslie's cube, was hot water, so...

Hi I'm trying to sort this concept out in my head and have reached a stumbling block! 1. ok so light travels through medium a and transmits through medium b and refracts. The angle or refraction is given by snell's law, and quantified by the refractive index of materials a and b. 2. But I...

Homework Statement A 120 cm-long steel string with a linear density of 1.2 g/m is under 100 N tension. It is plucked and vibrates at its fundamental frequency. What is the wavelength of the sound wave that reaches your ear in a 20 \circC room? Homework Equations Fundamental...

Homework Statement a) A microwave transmitter T and receiver R are placed side by side facing two sheets of material M (aluminium) and N (hardboard). A very small signal is registered by R; what can you deduce about the experimental set up? b) When M is moved towards N a series of maxia and...

Homework Statement A helium-neon laser beam has a wavelength in air of 633nm. It takes 1.38 ns for the light to travel through 30cm of an unknown liquid. What is the wavelength of the laser beam in the liquid? (IN NM) Homework Equations v=wavelength*frequency v= d/t The Attempt...

What is photon wavelength?! What is photon wavelength exactly? I know that the energy of a photon is E = hc/lambda, where frequency = c/lambda and lambda is the wavelength. So, what determines the wavelength of a photon? Is it the distance an electron falls from the conduction band back down...

Recently, it has been found that Cl2 can be released to the atmosphere in the marine boundary layer through mechanisms that oxidize chloride (Cl-) in sea salt aerosol. The Cl2 is unreactive at night and can build up to significant levels. Upon sunrise, Cl2 will photolyze, releasing very reactive...

If I am given the measurement of 10cm between phases what is the wavelength? I couldn't find the formula for it in my book :S help?

Homework Statement Light of wavelength 411 nm is emitted from a hydrogen discharge. What transition produces this emission? a. k = 5 to n =1 b. k = 4.5 to n = 2 c. k = 2 to n = 6 d. k = 2 to n = 3 e. k = 6 to n = 2 Homework Equations R = (1/n^2 - 1/k^2) The Attempt...

Why is the "bending" of waves related to wavelength? Hi! As stated in the title, my question concerns the "bending" of waves. (I'm quite sure that "bending" is not the proper term, so if you know the correct one, please tell me.) Let's say that we investigate waves in a ripple tank. We create...

"when light enters from one medium to other its frequency remains same whereas wavelength changes." i'm not able to understand this relation as frequency has a inverse relation to wavelength please help me to understand it thoroughly.

Homework Statement A sound wave has a frequency of 722 hz and a wavelength of .54 m. What is the temperature of the air? Assume the velocity of sound at 0 degrees Celsius is 327 m/s. Homework Equations V= lambda * frequency The Attempt at a Solution I have no idea what to from...

Czes discussion re Compton wavelength and new Smolin paper These are posts from the bibliography thread (which has enough to do just listing the new papers, without discussing them :biggrin:)

Homework Statement For a particular Dieletric it is observed that over a range of frequencies, the group velocity varies exponetinally with wave number: v_{g}=ae^{bk} , where a,b are constants. *(PLease not that the superscript g on v on the LHS side is meant to be subscript, however it...

Homework Statement Speed of an ocean wave depends on the wavelength \lambda in meters and gravitational field. (see equation below). Find values of P and Q. K is a constant and has no dimensions Homework Equations V = K\lambdaPgQ The Attempt at a Solution V=velocity, which is...

Why does glass not permit long wavelength infrared to pass through?

Hi there, Is it possible if an object were to hypothetically gain enough momentum such that its de Broglie wavelength is equivalent to, say, some light in the visible spectrum, that the object would emit light? Thanks!

Homework Statement I have a question relating to the interference at a single frequency? Does this statement mean that the intereference has occurred between two waves which are completely in phase? I also have a question regarding if two waves which are not in phase but do not cause...

if de Broglie's equation: wavelength = h/(mv) works allways, then what is the wavelength of an object at rest (v=0) is it undefined or infinity or something?

hi everybody In sound waves or EM waves .. What do we mean by saying 'wavelength' ! physically I mean , Is that related to the size of the photon for example ( In EM ) ? Help me to understand

I have to find matter wavelength and indeterminate of location and energy for hydrogen particle which is in gas with konwn p, V, T I'm sorry for my english skills:P pressure will be p_{g} \lambda = \frac{h}{p} p = mv v = \sqrt{\frac{3p_{g}}{\varrho}} \varrho = \frac{n\mu}{V}...

Homework Statement i'm doing a lab and i have a chart which requires me to find the wavelength. The chart looks like this: Frequency(f) Period (T) Length (l) Wavelength (lambda) 512 ? .15...

Homework Statement What is the frequency (in Hz) of infared radiation that has a wavelength of 160.432 micrometers? The speed of light is 3.00 x 108 m/s. Homework Equations Speed of light = wavelength x frequency Speed of light = 3.00 x 10^8 m/s The Attempt at a Solution I know that the...

A standing wave is set up in a 200 cm string fixed at both ends. The string vibrates in 5 distinct segments when driven by a 120 Hz source. What is the wavelength? * 10 cm * 20 cm * 40 cm * 80 cm I need some help with this problem. I can't seem to find anything with an equation or any...

A sound wave in air has a frequency of 500 Hz and a wavelength of .68 m. What is the air temperature? * -18 degrees C * 0 degrees C * 15 degrees C * 27 degrees CI can't find an equation for this, and I don't know how to solve it. Anyone know anything about this? Please help me. Thanks.

What is happening to a ray of light of a certain wavelength that passes through a transparent dielectric medium? Ex: Green light enters in a Bose–Einstein condensate, and slows down some. Than the light is coming out of the medium in free space. What will be the speed of the ray light and...

Homework Statement I am to calculated the wavelength of the laser I shone through different slit patterns to create diffraction patters on a screen. For the single slit diffraction, Data: xm is the distance from the central image to the mth minimum. x1 0.008 x2 0.015 x3 0.023 x4...

Hi, I'm studying the wave nature of particles. My book says that the de broglie wavelength of an electron is h / momentum, or h / (mv). I also have that E = hf = momentum2/(2m) = 1/2 mv2. I know that for a photon the frequency is speed of light / wavelength. I'm wondering why the...

Homework Statement Find the frequencies and wavelengths (in air) of these notes. A(440.0 Hz) C(523.3 Hz) the given frequencies are not the answers Homework Equations velocity=frequency*wavelength The Attempt at a Solution 343m/s=440Hz/wavelength wavelength=.780 m this isn't...

Homework Statement Red light with wavelength of 700 nm is passed through a two slit apparatus. At the same time, monochromatic visible light with another wavelength passed through the same apparatus. As a result most of the pattern that appears on the screen is a mixture of two colors...

Homework Statement the wavelength of the probing beam must be approximately the same as the size of objects we want to resolve. For each of the accelerators described below, determine the smallest size objects that are resolvable and name an object roughly that small, remembering that these...