Wavelengths Definition and 224 Threads

If a photon is used to ionize an atom then what happens to the photon? If the wavelength of the photon corresponds to the ionization energy, then the photon is absorbed/annihilated, yes? What if the photon has more energy. Is a lower energy photon emitted during ionization?

What causes the difference in wavelengths of light? Is it frequency or something?

I'm really confused about the de Broglie wavelength thing. Like I understand that according to the formula large objects have wavelengths that could not be observable in the real world but i still don't understand what type of wave de Broglie is referring to. Is he referring to longitudinal...

I'm doing a lab report on diffraction and interference. I've done several diffraction experiments (single slit, double slit, diffraction grating, Fresnel Biprism) to find the wavelength of the laser used. with Fresnel Biprism, wouldn't the refraction within the prism cause a change in...

How many energy levels the oxygen atom have? What energy (in eV) is required to get to each level. From my research i have only been able to find the first two levels, the first of which is a forbidden level. 1.=.98eV 2.=1.63eV

I just have a quick question. Which way of Atom Excitation is more efficient? Photon Energy which matches the absorption peak(s)? Or Photon energy of a Shoter wavelength than the absorbtion Peak?

short wavelengths carry no energy? Hey guys (and girls), I'm reading the book "The Black hole war", by Leonard Susskind and on the page 208 it has written something that kind of surprised me. I ll just quote an entire paragraph: "The hypothesis that light is composed of indivisible photos...

Homework Statement What is the de Broglie wavelength of a 10 microKelvin Rb atom? A 5000K electron? Homework Equations \lambda=\frac{h}{p} V=\sqrt{\frac{3KT}{m}} The Attempt at a Solution I used the velocity equation to find the velocity relating to temperature and mass. Then, as...

In the classical picture of an electromagnetic wave, the wavelength is specified along the direction of travel. However, with EM shielding that is using a grid (microwave, chicken wire), I've heard that so long as the spaces are less than the wavelength, you will achieve electromagnetic...

Homework Statement A double-slit experiment is performed with light of wavelength 558.0 nm. The bright interference fringes are spaced 1.84 mm apart on the viewing screen. What will the fringe spacing be if the light is changed to a wavelength of 335.0 nm? Homework Equations d=...

Homework Statement Two slits are 0.158mm apart. A mixture of red light (wavelength = 665nm) and yellow-green light (wavelength = 565nm) fall onto the slits. A screen is located 2.2m away. Find the distance between the third-order red fringe and the third-order yellow-green fringe...

Homework Statement the wavelengths of the emission lines produced by the hydrogen atom are given by the formula: 1/lambda = 1.096776 x 10^-2 ((1/n2^2) - (1/n1^2)) nm^-1 (a) what are the wavelengths of the first two lines in the Balmer series, H-alpha and H-beta (involving transitions...

Homework Statement http://www.strings.ph.qmul.ac.uk/~russo/QP/r06QPHYEX.pdf Question 3. The Attempt at a Solution I can easily derive the equation I need, which is: lamda = h/p Which after some playing around with K.E =1/2mv^2 etc we obtain: lambda (de brogile) = h/SQRT(2mKE)...

I've looked quite a bit on this forum and also elsewhere online and I cannot really find any information on my inquiry. If this is a double post please delete and send me in the right direction. Now I may be totally off on my thought process, but as I understand it the CMB first started off...

Homework Statement What are the three longest wavelengths for standing sound waves in a 128-cm-long tube that is (a) open at both ends and (b) open at one end, closed at the other? Homework Equations W=V/F The Attempt at a Solution 128 cm because nothing bigger could fit in the tube

What's the use of X-ray with angestrom wavelengh in imaging? Do you know of any good source to study more about that?

diffraction grating URGENT Homework Statement A spectrometer is used to analyze a light source. The screen-to-grating distance is 50.0 cm and the grating has 5000 slits/cm. Spectral lines are observed at the following angles: 12.98, 19.0, 26.7, 40.6, 42.4, 63.9 and 77.6. How many different...

Homework Statement Light goes through two slits 40 mm apart. Does an angle exist at which light of wavelength 440nm has a maximum and light of wavelength 660nm has a minimum?Homework Equations dsin\theta=m\lambda1 = maximum dsin\theta=(m+ 1/2)\lambda2 = minimumThe Attempt at a Solution I...

Homework Statement The wavelength of the photon emitted when a hydrogen atom undergoes a transition from the k state to the n = 1 state is around 94.8 nm. How much is k? Homework Equations 1/lambda= 1.97x10^7(1/1^2-1/k^2) The Attempt at a Solution...

Homework Statement In the Balmer series, how many spectral lines have the wavelength greater than 400 nm? Homework Equations 1/lambda= R(1/2^2-1/n^2) lambda=wavelength r=rhydberg constant 1.097x10^7 n= 3,4,5... balmer series is visible light The Attempt at a Solution...

Two pianos each sound the same note simultaneously, but they are both out of tune. On a day when the speed of sound is 348 m/s, piano A produces a wavelength of 0.765 m, while piano B produces a wavelength of 0.772 m. How much time separates successive beats? So I know: v=348 m/s...

Hello all, this is my first post on physics forums. I recently started working in a glass studio and am curious to know what radiation is being emitted by the equipment so that I can purchase appropriate eye protection. What wavelengths of harmful light are emitted from burning oxygen and...

Homework Statement An electron makes a transition from the third energy level to the lowest energy level in a box of width 0.1 nm. what is the wavelength of the emitted photon? Compare this wavelength with the wavelength associated with the transition from the third energy level to the ground...

Detailed ideas on how different wavelengths and pulse durations can limit scans

Question on electron orbitals and wavelengths?? Hi I have a couple of dumb laymans questions: (1) I have seen various diagrams of electron shells where some of them appear as ,roughly , rotating figure eights. Is there any physical conceptual interpretation of this? It would...

Hi optical engineers/physicists, I'm designing an optical sensor system, and it would be very beneficial if there was a method for determining the difference between two very close (down to tens of femtometers) optical wavelengths. The difference measured can be relative, although absolute...

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 speed of...

How many wavelengths could appear in the spectrum of hydrogen atoms initially in the n=5 state?

How does black absorb all the wavelengths ? & why does the reflection capacity of a transparent glass increases if black is put behind it .

Homework Statement The tube in a medical research X-ray unit uses lead (Z=82) as it's target. Assume the electrons are accelerated through the voltage calculated in part (b). What is the wavelength of the Kα line? Homework Equations KE=-13.6 ev ((Z-1)squared) / (1squared) KE=PE=VQ E=QV λ=hc/E...

Homework Statement Homework Equations Snell's Law: na*sin(theta of a) = nb*sin(theta of b) wavelength = index of refraction / n n = c / v The Attempt at a Solution The only information given in the problem is the 2 angles of refraction and of course n of air is 1, I do not understand how to...

Homework Statement What are the wavelengths in air of the lowest and highest audible frequencies if te range of human hearing is 20 Hz to 20 kHz and the sped of sound is 342 m/s? Homework Equations v= \lambdaf The Attempt at a Solution v= \lambdaf 342 = 20 Hz \lambda \lambda = 17.1...

Hi, I need some guidance on a particular question for my coursework. The questions states: Calculate the wavelength of L(alpha) and L(beta) x-ray photons produced from a copper target (Z=29) I have tried finding the wavelength using E=hc/lambda and re-arranged for lambda (lambda=hc/E)...

Homework Statement Light is incidence on a metal surface. For long wavelengths find E and B. What does it mean when it says for long wavelengths? Homework Equations The Attempt at a Solution

Hi. As you can see, the question is pretty straightforward. What is the difference between the Compton and the DeBroglie wavelength? I have looked into Wikipedia and other sites but I'm still somewhat confused. Thanks.

light wavelengths of 520nm and 630nm passes through a diffraction grating that contains 6000lines/cm. a) sketch a diagram of the image produced from m=0 to m=2. label the order of each fringe.b) calculate the angles for the first and second-order maxima that would appear on the screen. c) What...

Contemplating the propogation of Gravitation at roughly c in the form of a wave, has anyone ever attempted to quantify lambda, or the wavelength, in terms of meters or some other unit? Is there a gravitational spectrum, like there is an electromagnetic spectrum? And finally, could there be any...

Thanks for any help you can give. I just started modern physics and my teacher has a tendency to give questions that were based on things not mentioned in the book and only briefly mentioned in the lectures, so I'm a bit confused. Homework Statement 1) Calculate the distribution function of...

Are there wavelength limits at either end of the Electromagnetic spectrum? Is it true there could be a wavelength the size of the universe? What happens at the other end? Is there a quantum limit?

Hello everyone, here's a question that I have: Imagine your eye was sensitive in wavelengths of 0.4 mm to 0.7 mm rather than 400 nm to 700 nm. In this case, your mind would identify light waves that were 0.4 mm as blue and 0.7 mm as red. What would your world look like? How would it be...

Do higher wavelength radiation have more pronounced diffraction effects than low wavelength radiation, and why is that?

Homework Statement Ok,as part of my dissertation I'm trying to explain about how quarks have a bigger quantum wavelength than protons so when you localise a quark inside a proton, the uncertainty in energy of the system becomes really big so there's a load of creation/anhilitation of other...

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?