Wavelength Definition and 1000 Threads

Homework Statement In one of the classes, a recent experiment showing the interference of C60 molecules using a double slit apparatus was discussed. (a) If the average velocity of the C60 molecules is v= 200 m/s, calculate the De Broglie wavelength for a C60 molecule Homework Equations...

Homework Statement I know about particle/wave duality; however, when I read a passage and it says the wavelength of the particle I'm not sure what it's referring to. Is it the actual wavelength of the particle or the wavelength of the wavefunction for a particular eigenvalue? Homework...

Homework Statement What is the de Broglie wavelength of this electron? Given is 500 eV Homework Equations KE= 1/2 mv^2 1 eV=1.602x19^-19 J The Attempt at a Solution I converted the 500 eV to 8.01x10^-17 via the given conversion. Now I'm stuck.

Two speakers , each producing a pure tone of 1000Hz, are separated by 4m and are placed against one wall of a 15m wide room. You walk along the opposite wall of the room and hear the locations of the maxima and minima interference patterns a.)Find the wavelength of the sound. b.)Find the...

Homework Statement One string of a certain musical instrument is 79.0cm long and has a mass of 8.79g . It is being played in a room where the speed of sound is 344m/s . A)To what tension must you adjust the string so that, when vibrating in its second overtone, it produces sound of...

Homework Statement X-ray beam with wavelenth= 1 X 10-10m and a gamma-ray beam from a Cs137 sample with wavelength= 1.88 X 10-12m. If the radiation scattered form free electron is viewed at 90 deg to the incident beam a) What is the Compton wavelength shift in each case? b) What kinetic...

Homework Statement How does the frequency and wavelength alter between the same note played on an oboe and violin. And also what physical difference in the waves allows them to be played loudly or softly. Homework Equations The Attempt at a Solution For the oboe and violin part...

Hi all, Could someone pls explain to me what is bragg detuning?...or some links explaining this phenomenon?

In Classical Mechanics the derivative of Kinetic energy with respect to velocity is momentum, so I was wondering if this is valid: In this L is lambda or wavelength and h is Planck's Constant. E=hf, therefore E=h(v/L) This means that dE/dv=h/L.(h and L are constants and the derivative of...

Homework Statement De Broglie wavelength What is the De Broglie wavelength of the 1.0-TeV (1TeV=1012eV) protons (mpc2=938.3MeV) accelerated at the Fermilab Tevatron accelerator? These high-energy protons are needed to probe elementary particles [Hint: You need to use relativistic formula, but...

If, in the expression for the de Broglie wavelength, we let m -> infinity, do we get the classical result for matter? de Broglie wavelength = h/mv so as m goes to infinity the de Broglie wavelength goes to 0. So does this mean that particles with larger mass don't display wavelike...

Homework Statement Compare the deBroglie wavelength for an electron in the n=6 orbit of He+ compared to the n=2 orbit. Is the deBroglie wavelength the same, smaller, or larger? Derive this. Homework Equations Quantization of Paths of Electrons: 2 pi r = n (lambda) Bohr Radius: rn=n2 aB The...

The wavelength of light increases over large distances right? It seems that there is no account for this when determining the redshift of a distant star.

Homework Statement The problem asks to find the wavelength of a tuning fork with 1000Hz frequency. Then they give you two consecutive resonant lengths which are 25 cm and 76 cm. The way they measured the resonant lengths is by placing the tuning fork over a tube that has 1 end open and 1...

hi folks, here's another problem I've made a few incorrect guesses on. On my other post I may have not mentioned the potential for errors in using various SI units, but I think in general I'm careful enough so I'll continue to not worry about that in this post. So assume I know enough to...

With reference to the formula: distance (wavelength) = k / frequency what does a wavelenght of 1176470.58 signify with regards to the fundamental frequency of a typical adult female being between 165 to 255 Hz, where d = 300/.000255 = 1176470.58 Would greatly appreciate advise...

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?

Homework Statement A hydrogen atom has an electron in the fundamental state. a. Show that a radiation with λ = 50 nm will ionize the atom. b. What will be the excess kinetic energy of the electron in joules? Round up your answer to the nearest hundredth. Homework Equations 1/lambda=...

Homework Statement The problem is a semiconductor question which I have resolved and gotten the equation: w = (50.12 x) ^ 0.5 From the knowledge of this system, x is in an interval such that 0.5 < x < 2.5 What mathematical method of solution would help find the solution to this...

Homework Statement it's stated that 2.5meters separated a trough and an adjacent crest of surfae wave on a lke. Homework Equations The Attempt at a Solution At first I thought if the trough to th crest is 2.5meters then i would double that to get the wavelenght from crest to...

Homework Statement a father and son went on a cruise that's 20 ft long. the dad observed the cruise swayed thru 22 complete oscillations in 38 s, and one wave crest pass per/oscillation. the son noticed that each crest required 13s to reach land and the wavelenght is twice the length of the...

Please help! In my physics, I need to find the wavelengths of the waves from a source in a different medium. In the first medium, my angle of incidence is 35 degrees and with a speed of 150m/s and a frequency of 75Hz. In the different medium the speed has dropped to 96m/s. I know the...

Homework Statement Your favorite radio FM radio station broadcasts at a carrier frequency of 94.7 Megahertz. What is the wavelength of the carrier frequency radio signal? Homework Equations velocity=wavelength(frequency) The Attempt at a Solution 94.7x10^-6(w)= 3x10^8 w= 3.2...

Is a photon's wavelength dependent on the velocity (or acceleration) of the atom which it was emitted? For example, if a photon is emitted from a stationary (or slow moving) molecule, then that molecule is accelerated. Will the photon's wavelength shift wrt to the acceleration (or...

Is it possible for an object's size to be great enough to make it's wavelength or amplitude < a Planick length? If so, does it's position become certain, and, applying the uncertainty principle, can you not know the velocity?

Hi there! What is meant by saying that a photon of smaller wavelength can resolve smaller distances? I know from scattering theory that the form factor is the Fourier transform of the charge distribution and that knowing the form factor at high momentum transfers gives a better overall picture...

Homework Statement 1. What property of light causes the sunlight to reach the Earth before the sun actually appears over the horizon? 2. What is the wavelength, in water, of blue light whose wavelength is 4.5 x 10^2 nm in air? 3.The speed of a certain liquid in a certain liquid is 3/4...

Homework Statement Radio 4 transmits on FM at a frequency of 92.5 MHz Calculate the wavelength and use it to explain why listeners in deep valleys cannot pick up radio 4 FM. Homework Equations The Attempt at a Solution

http://en.wikipedia.org/wiki/Electromagnetic_waves Please navigate to this link about electromagnetic waves. Scroll down a little you will see a drawing on left hand side under topic "Properties" which denotes electric and magnetic field components of light as an example of an electromagnetic...

Homework Statement my question is simple and doesn't really fit the template. Is wavelength and period of a wave not the same thing?

I hope this is the right place. Since the law is derived from statistical mechanics, I assumed this was the place to post. I understand how the Wien's Displacement law is derived. What I don't understand, other than mathematically, is why there is a difference between the peak intensity as...

Homework Statement : The diagram represents two coherent light sources emitting light of equal intensity and wavelength. The intensity of the light at point P is zero. Which of the following could be the difference in path length taken by the light in traveling from each source to point P...

Homework Statement I am trying to describe the limit for the minimum radius of a star to first year university level students in order to describe the reason for the size of the Sun. I'm a bit confused by the critical density of the material in the star's core and how we know that the main...

Homework Statement The question is from Advanced Physics by Adams and Allday, section 8 Practice Exam Questions, question 30. Estimate the de Broglie wavelength of an electron that has been emitted thermionically in a vacuum from a filament and then accelerated through a p.d. of 30.0 kV...

Alright first time poster here with a question that has been eating at me for a while. I am curious to know if there is a substance that when one part of the EM spectrum is passed through it, it would come out as another. I know that if you are to shine a lightbulb on some black cloth you would...

I am reading some material about compton effect. I am wondering in what reason we have to use short wavelength photon in compton scattering, why can't we use long wavelength instead?

Homework Statement A tube of air is open at only one end and has a length of 1.7 m. This tube sustains a standing wave at its third harmonic. What is the distance between one node and the adjacent antinode? Homework Equations v = f (lambda) The Attempt at a Solution If it's in the...

Homework Statement Barium has a work function of 2.48 eV. What is the longest wavelength of light that will cause electrons to be emitted from barium? Homework Equations W = hf○ hf = W + Ek E = hf = hc/λ The Attempt at a Solution 1 eV/1.6e-19 C = 2.48/X X = 3.97e-19 W=hf○...

hey everyone, Homework Statement I'm doing a sodium and mercury visible light spectroscopy lab at the moment. By using a PMT, I can detect the intensity of photons emitted as a function of wavelength (controlled parameter). I was wondering if anyone knows how the two relate theoretically...

Homework Statement "Light of wavelength 0.527 µm (in air) enters the water in a swimming pool. The speed of light in water is 0.700 times the speed in air. What is the wavelength of the light in water?" Homework Equations v = c /n, where n = 1.33 ,the index of refraction The...

Homework Statement A longitudinal wave with a frequency of 34 Hz takes 1.3 s to travel the length of a 2.5 m Slinky (see Figure 16.3). Determine the wavelength of the wave. λ = _______ m Homework Equations v = λ f v = d/tThe Attempt at a Solution v = d/t v = 2.5/1.3 v = 1.9 v = λ f λ = v/f...

Given: \lambda = h / (mv) , whehere lambda is the wavelenght of electron, h Planck's constant, m the rest mass of electron and v the speed of electron. Problem: Does electron has a mass? I know it has a rest mass and thus contain energy. This problem is perhaps a defination problem.

How does the refraction index vary with wavelength? For example, if you take light that initially has just one wavelength and disperse it through a prism and calculate the different indices for each wavelength. I'm guessing they'll be different... Is it linear? exponential? etc.

Homework Statement Question 1) Calculate the de Broglie wavelength of a neutron (mn = 1.67493×10-27 kg) moving at one fiftieth of the speed of light (c/50). Question 2) Calculate the velocity of an electron (me = 9.10939×10-31 kg) having a de Broglie wavelength of 225.7 pm...

Homework Statement A transverse wave on a string is described by the wave function y = (.120m) sin(pie/8 + 4pie(t)) (a) Determine the transverse speed and acceleration of an element of the string at t=0.200s for the point on the string located at 1.60m (b) What are the wavelength...

Homework Statement White light spans the wavelength range be- tween about 400 nm and 700 nm. If white light passes through two slits 0.656 mm apart and falls on a screen 1.7 m from the slits, what is the distance between the first-order violet and the first-order red fringes? Answer...

Is the color of the first wavelength of light that is absorbed first blue or red? Mare

Homework Statement A beam of light from a monochromatic laser shines into a piece of glass. The glass has thickness L and index of refraction n=1.5. The wavelength of the laser light in vacuum is L/10 and its frequency is f. In this problem, neither the constant c nor its numerical value...

what does the momentum in de broglie wavelength signify? i mean how do u defien it...we can define the expectation in momentum but how do we define momentum for "quantum mechanincal" particles

How we can find wavelength of a wavepacket? Which distance is wavelength?