Wavelength Definition and 1000 Threads

A mechanical oscillator connected to the end of a stretched string creates a transverse displacement of the end that is given by ξ = 0.009 sin(22.8 t), where ξ is in meters, t is in seconds (and the argument of the sin function is in radians). The tension in the string is 11.08, and the string...

Dear all, Let's assume that I have just bought the perfect omnidirectional antenna and I try to understand how the wavelengths are transmitted. If I got it right, there are wavelengths getting 'out' towards the 360 degrees directions. Now let's assume that I have a perfect receiver antenna...

Homework Statement H-atom is exposed to electromagnetic radiation of \lambda=1025.6 \dot{A} and excited atom gives out induced radiations. What is the minimum wavelength of these induced radiation: (a)102.6 nm (b)12.09 nm (c)121.6 nm (d)810.8 nm Homework Equations The Attempt...

Hey guys, In diffraction of light, why must the slit width be of comparable size to the wavelength of the light being shone on it for diffraction to be noticed most? Thanks

Homework Statement Monochromatic radiation of specific wavelength is incident on H-atom in ground state. H-atom absorbs energy and emit subsequently radiations of six different wavelength. Find wavelength of the incident radiation. (a)9.75 nm (b)50 nm (c)85.5 nm (d)97.25 Homework...

Homework Statement The energy required to dislodge electron from sodium and metal via the photoelectric effect is 275 kJ/mol. What wavelength in nm of light has sufficient energy per photon to dislodge an electron from the surface of sodium? Homework Equations How do I convert 272 kJ/mol...

Photons are blue-shifted as they accelerate in free-fall toward the earth. When an electron or positron is conceptualized as a wave using de Broglie's equation, are the de Broglie wavelengths of the electron or positron shortened (blue-shifted) as they accelerate toward the Earth in free-fall...

Not sure how to figure this one out, or where to start: The diagram represents a snapshot of a standing transverse wave on a flexible guitar string taken when the displacement is at a maximum. (Note: the vertical scale is very exaggerated, the actual sideways displacement of the string is...

Homework Statement What is the wavelength of an electron with a kinetic energy of 2.00 MeV? What is the wavelength of an electron with a kinetic energy of 2.08 GeV? (Possibly useful constants: hc = 1239.8 eVnm, rest energy of the electron: E0,e = 511.0 keV.) Homework Equations...

Me and my Dad were having a conversation about the elongation of EMR wavelengths over an extended period of time. He began to explain to me what Red Shift was but I couldn't understand what he was trying to get at (he's a poor explainer, or I'm bad listener). But his explanation did spark an...

Can somebody please explain the Compton effect to me... I don't get how Compton came up with the wavelength after scattering - the initial wavelength = h/the mass of the electron*the speed of light*(1-cosine of the scattering angle). Thank you!

Why is the de Broglie wavelength sometimes larger than the particle it describes? Thanks, Jake

Homework Statement A transmitter sends out 1.8x10^7 waves per minute and generates a standing wave pattern. The radio waves travel at the speed of light to a receiver 20.0km away. Determine : a) the frequency in herts b) period c)wave length d) the time for one crest to travel from the...

As I understand it, photons are their own anti-particle, and at all points in space there are a lot of virtual particle-antiparticle pairs being created and annhilated (perhaps infinite?), so it would seem to me that on it's journey from point A to point B that there is at least some likeliehood...

Homework Statement two speakers which are placed 5m apart at one end of a large room are connected to a signal generator which puts out a 2kHz sinusoidal waveform. Calculate the wavelength of the sound. The second part of this question is: describe what a person would hear as he moves slowly...

Homework Statement What is the temperature of a star if the flux at 450 nm is measured to be 1.3 times the flux at 650 nm. Homework Equations I tried to use the equation Flux = 2πhv3/c2...

Frequency changes relative to the observer due to the doppler effect. Does wavelength?

I've been reading The Elegant Universe by Brian Greene and everything has rolled along smoothly until just recently. He writes: Furthermore: So here's my question. How does the ideal blackbody (which I assume the oven to be in this case) magically know what wavelength to emit to fit...

Homework Statement Sally sue and her partner hold a spring 4 meters apart. There were 5 nodes in the standing waves produced. Sally moved her hand from the rest position back and forth along the floor 20 times in 4 seconds. F Homework Equations The Attempt at a Solution Since...

The basic question is: will a photon traveling through a vacuum lose some of its energy due to interactions with gravity from a massive body? Gravitational lensing implies that the photon will change its initial direction but is its energy conserved (i.e. differences in blueshift/redshift...

Homework Statement the displacement of a wave traveling in the negative x-direction is given by y(x,t)=(5.2cm)cos(5.5x/m+72t/s) where x is in metres, t is in seconds, calculate: i)the frequency ii) the wavelength iii) the speed of this wave) The Attempt at a Solution i have...

I have found 2 different representations of Compton wavelength: \lambda= \frac{h}{mc} and \frac{\bar{h}}{mc} which of these is correct, and if both are right, how do you know when to use one or the other? (note: the second equation contains a h bar as in " h bar = h/2pi ")

On the Solar and Heliospheric Observatory (SOHO), a satellite which observes the sun from the First Lagrangian Point, there are 4 different Extreme Ultraviolet Imaging Telescopes, each with a different wavelength: 171 Angstrom - 1 million degrees Kelvin 195 Angstrom ~1.5 million degrees...

Question-A certain crystal has a set of planes spaced 0.376 nm apart. A beam of neutrons strikes the crystal at normal incidence and the first maximum of the diffraction pattern occurs at a scattering angle (i.e angle between incoming neutrons and reflected beam) of 41.4 degrees. What is the de...

Any wave is identified by its wavelength (or frequency), and the wavelength is the distance between the two consecutive crests (or troughs) in wave trains. But wave is not identified by its amplitude. The wave could have been described by the amplitude as it doesn't require two wave trains (or...

i was working on atomic structure and i stuck here. how can a wave be associated to any material? is it related to wavelength of colur it emits or is it the wavelength of vibrations after it has been stuck by something? what is it??

Homework Statement What is the DeBroglie wavelength of an electron whose energy is (a) 1.0eV (b) 100eV? What is the kinetic energy in eV of an electron whose DeBroglie wavelength is that of visible red light at 650nm? Homework Equations λ=h/p = h/mv h = Planck's constant...

Is amplitude always perpendicular to the rest axis? in a wavelength amplitude it the distance between either the crest or through from the equbilium line. then in the case of transverse vibration, what is its amplitude? thanks

Hello, I am trying to understand an equation stated in the book 'Principles of Protein X-Ray Crystallography' by Jan Drenth (The exact page I am reffering to can be found here...

Homework Statement Suppose that a beam of light consists of photons having an energy of 5.4 eV. what is the wavelength of the light? Homework Equations hc = 1240 eV*nm E = \frac{hc}{\lambda} The Attempt at a Solution 5.4eV = \frac{1240eV*nm}{\lambda} \lambda =...

Homework Statement Find the length of the smallest standing wave that can be formed with light having a frequency of 600THZ. Homework Equations f = 600*10^{12}Hz c = 2.998x10^{8}\frac{m}{s} \lambda f=c The Attempt at a Solution \lambda f=c \lambda...

Why tsunami waves have a very long wavelengths?

Homework Statement An electron of charge e and rest mass m0 is accelerated to relativistic speeds by a potential V. Show that the deBroglie wavelength is given by the expression lambda= h(2m0eV)-1/2 (1+eV/2m0c2)-1/2 The Attempt at a Solution eV = gamma m0c2 equation one p = gamma...

If two wavelengths of standing waves on a 12 meter rope secured at both ends are 2 meters and 1 meter, which of the following could not be a standing wave wavelength on teh same rope with the same tension? Choices are: 4m, 2.5m, 1.5m, 67cm 12-2 =10, so 1\2 would be 5 and 12-1 = 11, so...

Homework Statement A CD stores data in digital form by encoding it into a grooves as a series of bumps of height 160 nm above the base of the groove. Explain how infromation is picked up from the CD using a laser and calculate its wavelength. Can someone please explain how to do this...

Homework Statement What is the velocity of an electron having a De Broglie wavelength that is approximately the length of a chemical bond? Assume this length to be 1.6 A Homework Equations wavelength= h/mv The Attempt at a Solution I fixed the equation to isolate the velocity...

i need help in these equations please : Q1 - if there is a frequency 440Hz for a sound wave in air with velocity 430 m/s calculate wavelength and wavenumber. --------------------- Q2- the speed of light about 3X 10⁸ m/s find the wave length and wave number for the frequency 5x 10¹⁴ Hz...

Hello everybody Basically as the topic states: How can you calculate "The spatial wavelength of a Halbach array" (symbol lambda)? Context: The reason I ask is that since I've got bored during my easter holidays I decided to try a wee science project and try and make a model of an...

I know that prisms create dispersion and cause different frequencies of light to travel at different angles relative to the normal, and that the prism affects the wavelength and speed of the waves, but what exactly is the nature of this relationship? Other than spreading various frequencies out...

Ok so I was sitting out back one day listening to some music with some friends around. We had some music playing on a stereo inside the house and we were out the back with the glass door open about 10 cm's. I thought I noticed that some sounds with different frequencies seemed louder then...

I volunteered to help out with a research project, and we need a solution for a way to filter out light of the blue wavelength from a light source. THe blue wavelength is the only wavelength we want to remove. I was wondering if anyone here had any suggestions? Someone from the project suggested...

I am having difficulty with this problem. I have solved all of the other ones and got them correct, but this one is stumpimg me. Transition A produces light with a wavelength of 400 nm. Transition B involves twice as much energy as A. What wavelenth light does it produce? Help please.

Light of wavelength 680 nm in air enters water making an angle of 40 degrees with the normal. Find the angle of refraction and the wavelength of light in water. I found the angle of refraction, but I don't know how to calculate the wavelength with this information.

Homework Statement A transmission diffraction grating with 528 lines/mm is used to study the line spectrum of the light produced by a hydrogen discharge tube. The grating is 1.3m from the source (behind a hole in the center of a meter stick). An observer sees the first-order red line at a...

Homework Statement http://i213.photobucket.com/albums/cc285/havenater23/RIP.jpg?t=1301441030 I've been trying out things on this problem, I really need some help. I tried finding the frequency by counting the waves and dividing it by the seconds it takes through the waves. EX : 4 (Waves)/...

which of the following particles would have shortest wavelength provided that all move with the same kinetic energy? electron, proton, neutron, alpha paricle? My professor said in class that it was alpha particle, but i think its electron... which one is right? and why?

Homework Statement To "obeserve" small objects,one measures the diffraction of the particles whose de Broglie wavelength is approximately equal to the object's size. Find the kinetic energy(in electron volts) required by the electrons to resolve c) a nucleus of size 10fm. Homework...

Homework Statement what is the minimal wavelength of electromagnetic radiation to pair-produce an electron-positron pair? Homework Equations ~ = wavelength hc/~ = 2MeC^2 + K The Attempt at a Solution hc/~ = 2MeC^2 = 2(9.11x10^-31)(3x10^8)^2 ~ = 8.24x10^-11m is tis correct?

Homework Statement In a lab that we performed, we had a closed tube with piezo electric transducers on both ends, and they were attached to a frequency generator. We found the frequencies that caused resonance, and the lab wants us to calculate the velocity of the wave using data. The lab...

I have a few questions: 1. 'small smoke particles in air are seen under a low magnification microscope to move randomly at a speed of 0.10mm/s. The speed of sound in air is 330m/s. Estimate the mass of the smoke particles. I cannot make the link between speed of particle and speed of sound -...