Wavelengths Definition and 232 Threads

Homework Statement A light wave is propagated from point A to point B in space. We introduce along the way a glass lens with parallel faces of index 1.5 and width L=1mm. The value of teh wavelength is 500μm in space. How many wavelengths are between A and B with and without the glass lens...

Homework Statement Particles approximately 3.0 x 10^-2 cm in diameter are to be scrubbed loose from machine parts in an aqueous ultrasonic cleaning bath. Above what frequency should the bath be operated to produce wavelengths of this size and smaller? Homework Equations Fn = nv/(2L) v=...

i want to know the approx wavelengths of the following colours blue green bluishgreen yellow orange violet red the wavelengths should be in amstrong unit and also in meter .

Is this forum ok for posting EE student questions? I guess I'll find out. :biggrin: Homework Statement How many photons per second does a low power (1 mW) He-Ne laser (\lambda=336nm) emit? At what He-Ne laser power do you expect quantum effects to become important? The Attempt at...

Homework Statement How many photons per second does a low power (1 mW) He-Ne laser (\lambda=336nm) emit? At what He-Ne laser power do you expect quantum effects to become important? The Attempt at a Solution I got the answer to the first part, 1.7\times 10^{15} photons/second. But the...

1. A nonreflective coating (n = 1.24) covers the glass (n = 1.52) of a camera lens. Assuming that the coating prevents reflection of yellow-green light (wavelength in vacuum = 564 nm), determine the minimum nonzero thickness that the coating can have. 2. wavelength of the light in the...

As in, for example, boundaries between UV and visible, UV-A and UV-B, blue and purple, gamma rays and x-rays. Or are they ill-defined and subject to the Sorites Paradox? Also, does anyone know if there is a highest level of energy a gamma ray can have? Thanks!

I ordered these giant fesnel lenses online. They are about 2.6 by 3.3 feet, and can supposedly melt asphalt. I was just wondering what is the main wavelength that causes the energy: visible light, ultra-violet, infrared, some other that I don't know about, or all of them?

Hi all, If the energy states of electrons are quantized, are there finitely many wavelengths that a photon can have within, say, the visible spectrum? If so, how many? Thanks, Yury

I cannot understand what is the colour of water.I was reading an Optics book by Hecht,& suppose that we see coluured bodies due to Dissipative absorption.That is taking up of incident photon,converting a part into thermal energy,and releasing the rest energy as another photon.But, ordinarily we...

The ionization potentials of HI and KI are 13.6 and 4.3 ev. Calculate the wavelengths of photons that can ionize HI and KI. Calculate the photospheric temperatures of stars that peak at these wavelengths, and hence radiate plenty of photons at shorter wavelengths capable of ionizing these...

"Is there a Doppler effect if a sound source and an object are moving at right angles?" I assume this means that both are moving away from a single point... I thought there would be a Doppler effect because both objects are moving and therefore the sound produced has an effective longer...

If a photon and an electron have the same energy how would i show that their wavelengths differ (relativistically)? Furthermore, how would I find the energy when the difference between the wavelength of the photon and electron is a factor of 4? thanks

How am supposed to calculate the five longest wavelengths of the Lyman series? What values of n are used? I see how you arrive at a definite limit as n goes to infinity, but the five longest? Sort of a dumb question.

X-ray tubes used by dentists can have voltages as high as 80kV to accelerate the elecrons to produce the X-rays. What is the most lowest wavelength that can be produced by such electons? This problem seems almost too easy... i need a check \lamba = \frac{1.24x10^3 V^{-1} nm}{80kV}...

A parallel beam of light containing two wavelengths, 1 = 400 nm and 2 = 650 nm, enters the silicate flint glass of an equilateral prism with an angle of incidence of 49 degrees. At what angle, relative to the normal, does each beam leave the prism? This seems simple, but previously, I had...

Ok, I am working with problems dealing with Speed=(lambda) (frequency). I have a question in determining whether I am solving these correctly. I sometimes get confused as what the wavelength is. 1. A longitudinal wave with a frequency of 25.0Hz travels along a coil spring. If the distance...

http://137.229.52.100/~physics/p103/applets/sos_prelab/sos_prelab_pt1.html For my homework, i have to use this java applet and answer the 5 questions at the bottom. Now, i had no problem finding the period, frequency, or length of the tube in terms of the wavelength. But I'm really having...

This is a post-lab question for my chemistry lab but it is kind of physics too so I thought I'd post it here (the other sciences sections don't much response).. It's confusing because the questions are supposed to go along with what we are learning in the chemistry lecture, but we're behind in...

A read of the COBE and WMAP teams' papers on the methods they used to produce 'contamination-free' maps (or, to remove all 'foregrounds') is exhilarating. However, unless I missed it, these methods largely address emission in the wavelengths of interest (i.e. those which the various...

When we look at the sun, does light emitted from the edges of the sun have a different wavelength than light emitted from the center of the disk?

could i get help or a formula for this question please Use the Energy Levels for Hydrogen to calculate the wavelength corresponding to the following electron transition Transition Energy in ev's Emitted wavelengths in m 2->1______ ________x10______

Hi, could someone please help me get started on this problem. The figure is a right angle triangle with 30-60-90 degree angles (right angle). Can you help, please. Thank you so much. The glass prism shown has an index of re- fraction that depends on the wavelength of the light that enters...

Ok, for this one problem, I'm supposed to figure out the difference in wavelength between the first line of the Balmer series in ordinary hydrogen (M= 1.01 u) and in "heavy" hydrogen (M = 2.01 u). The balmer series is when the lowest n is 2, by the way. I already know that the wavelength for...

Low level transmission of every electromagnetic wave starting from long -wave radio to gamma rays. Thousands of different transmitters not necessarilly being powerful at all, converging on one spot. Wouldnt this create massive electromagnetic spikes here and there? Just as if you were to...

Does anyone know the range of the wavelengths of the UV light that reaches the Earth (ground)?

What is it that allows longer wavelengths to travel further than shorter wavelengths? Is it because of diffraction properties or is it related to the energy of the wave? Or perhaps a combination of several things...? Thanks. Russ

Here is a question I am having trouble with :rolleyes: , thanks for your help. Electrons are ejected from a photoelectric surface with a maximum speed of 4.20 * 10^5 m/s. If the work function of this surface is 2.55 eV, what is the wavelength of the incident light? This is how i tried...

What part of the spectroscope separates entering light into its component wavelengths?

Here is the question: Violet light has a frequency of 7.5 * 10^14 hz and travels from air to glass at an angle of 30 degrees. The index of refraction for violet light is 1.54. A) Find the angle of refraction B) Find the wavelength in air C) Find the wavelength in glass D) What is the...

Wavelengths and dissociation?? I needed some help with this problem. By using photons of specific wavelengths, chemists can dissociate gaseous HI to produce H atoms with accurately known speeds. When HI dissociates, the H atoms move away rapidly, wheras the relatively heavy I atoms move...

A ray of light consists of blue light(480nm wavelength) and red light(670nm wavelength) is incident on a think piece of glass at 80 degrees. what is the angular separation between the refracted red and blue beams while they are in glass? (The respective indices of refraction for the blue light...