Wavelength Definition and 1000 Threads

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?

Hey all, A physics example I'm working on to do some studying. The example is as follows: What is the wavelength of the scattered photon when a free electron (initially stationary) acquires maximum energy in a collision with a photon of energy 4 x 10^3 eV? My problem is this: it seems...

The de broglie wavelength is h/p, where p is momentum, and hence mv, so wavelenght = h/ (mv). The mass is on the denominator, so a massive object, like a baseball, will have a small wavelength, beyond detection and we can ignore it. OK, so does the mass have to be moving to have a de broglie...

What is the relationship wavelength and group velocity in wave packet ? If a wave packet has big wavelength its group velocity bigger or not ?

Homework Statement When light is frequency 2,00 x 10(in 16force) Hz prostrate a metal surface electrons are abstracted with kinetic energy 7,50 x 10(in -18force) J. Calculate: (a) The frequency v0 for the metal (v0: the minimum frequency of light, below which no electrons emitted). (b)...

Homework Statement A Michelson interferometer is operated in a vacuum, using monochromatic light of wavelength 589 nm. The interferometer is set up so that the distances between the moving mirror and the beam splitter and the fixed mirror and the beam splitter are equal. A parallel-sided...

Homework Statement The portion of a piano string between the bridge and upper end of the finger board is 0.50 meters long. The string when plucked sounds a note of 440Hz- the first harmonic. a. where must the violinist put a finder to pay a C note- 528Hz b Without returning, is it possible...

Homework Statement Light of wavelength 0.544 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 mu = m / L v = sqrt (F/mu) speed of air 386 m/s The Attempt...

Finding index of refraction using wavelength and 2 angles?? I'm not sure how to do a problem that involves a light ray striking a block/air interface, how to find the index of refraction of a transparent material when given the wavelength, the angle the light ray makes with respect to the...

Hi! I really need some help I'm really really not good at physics...so Here it is 1) The electron energy of a hydrogen atom is given by -C/n^2 relative to zero energy at infinite separation between the electron and the proton (n is the principle quantum number, and C is a constant). For...

According to our lab manual, the graph of Wavelength vs Period : the slope should be the speed of sound. Well, I have a negative slope of -32.2 which is ridiculous, but I can't find out what I'm doing wrong. We had 5 tuning forks , say for instance, 512Hz...the inverse 1/f = 1/512= 0.00195 , I...

What property of visible light defines its color, the wavelength or frequency (or something else)?

Homework Statement If the maximum energy imparted to an electron in Compton scattering is 45 keV. What is the wavelength of the incident photon? Homework Equations The Attempt at a Solution \lambda_2 - \lambda_1 = h/mc (1 - cos \theta ) My first initial thought was to apply...

Homework Statement A 220lb fullback runs the 40-yd dash at a speed of 19.6 ± 0.1 mi/h. What is he de Broglie wavelength (in meters)? Homework Equations de Broglie Wavelength: λ=h/(mu), where λ=wavelenght, h=6.626 x 10^(-34) kgm^2)/s, m=mass (kg), and u= speed The Attempt at a...

I'm sorry if this is the wrong forum but in a problem I was given wavelength with the unit as an A with a circle above it, can anyone tell me what this means and how I can get it into more familiar terms (meters, for example)?

Homework Statement A photon whose energy is 8.00E-15 J is scattered off an electron at a 90 degree angle What is the wavelength of the scattered wave? Homework Equations i know that Lamda = hc/E =6.63E-34 * 3E8 / 8E-15 =2.48E-11m The Attempt at a Solution Does anyone know how...

Homework Statement The element Be has 4 electrons and 4 protons in the atom. An ion of Be has all the electrons removed except 1, so it resembles a hydrogen atom with a nuclear charge of +4 e. Constants: E1(Hydrogen)= -13.6eV, r1(Hydrogen)= 5.29x10-11m. If a gas is made up of ions...

What has been the longest photon wavelength actually observed?

If you are told that a silver surface is irradiated with light having a wavelength of 230 nm that causes electrons to be ejected with 77.67 kJ/mol of kinetic energy, how would you find the threshold frequency? I know that threshold frequency = W / h. W is the work function and h is...

Homework Statement Calculate the de broglie wavelength (DBW) of an electron with kinetic energy 60 GeV. What percentage of an atom's diameter can it penetrate? Homework Equations DBW = h/p p=mv The Attempt at a Solution Basically I have an electron traveling at the...

Re the article by Bojowald in the October issue of Scientific American about Loop Quantum Gravity. He states that one of the consequences of the theory is that the speed of light is a function of wavelength. Any experimental evidence, or even hint of evidence, that anyone knows of?

Homework Statement Light passes through a 200 line/mm grating and is observed on a 1.0 m wide screen located 1.0 m behind the grating. Three bright fringes are seen on both sides of the central maximum. What are the minimum and maximum possible values of wavelength? Homework Equations...

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...

If the primary germicidal UV wavelength is 270nm and the secondary is 254nm and I have a UV light source in air to provide germicidal effects in water, would the wavelength of the UV light source need to be 360nm and 338nm respectively assuming the index of refraction for water to be 1.33?

Homework Statement We learn from school that when we shine white light through a prism, dispersion occurs. This is because the light of varying wavelengths are refracted to a different extent due to how refractive index varies with the wavelength of light. So why does refractive index vary...