Photoelectric effect Definition and 395 Threads

The Photoelectric effect and "classical physics" The kinetic energy of the ejected electrons predicted by the classical physics should be related to the intensity of the light. According to experimental results, the kinetic energy of the electrons is proportional to the frequencies of the...

A sinusoidal EM wave which length l is very great, hits a photoelectric device. According to HUP, a sinusoidal EM wave with finite length l has a spectrum of frequencies which broadness is inversely proportional to l. So, if l is very great, the energy uncertainty is very low, and this, still...

:confused: why can't wave nature of light explain photoelectric effect?

Light is incident on the surface of metallic sodium, whose work function is 2.3 eV. The maximum speed of the photoelectrons emitted by the surface is 1.26e6 m/s. What is the wavelength of the light? I first converted Work Function to Joules: 2.3eV x (1.6e-19 J / 1eV) = 3.68e-19 J The...

White light (ranging in wavelengths from 380 to 750 nm) is incident on a metal with work function Wo = 2.46 eV. (a) What is the maximum kinetic energy of the electrons emitted from the surface? KEmax = eV E = hf = hc/lamda. E = (6.626*10^-34)(3*10^8) / (750*10^-9) = 2.6504E-19...

What is the main differences? Are they essentially the same thing? From what I have gathered, the two are fundalmentally the same. If a photon gives up all its energy after interaction with an electron than the photoelectric effect applies. On the other hand if the photon continues to travel...

Hello my question involves what exactly is the frequency and intensity of the light. The E = hf applies to the photon particle aspect of light right? So where is f from, the wave aspect? Also increase f, which increases E makes the electrons eject faster in terms of kinetic energy right, but...

Hi guys, I've got a little conceptual question here. I became a little confused after my exam. Firstly, I understand that in the photoelectric effect, the electrons either accept all or none of the energy from the particular incident photon and the photon must have a minimum frequency...

Hi guys, I've just returned from my exams.. I thought it was pretty alright but I think it could've been better. I was stuck with this question. A photoelectric experiment was set up. Monochromatic light is incident on a metal plate, and the photo-electrons are collected at a electrode...

Apologies if this has come up before, but a week or so ago I read a paper or article that said the photoelectric effect was not necessarily a particle phenomenum after all, despite Einstein's Nobel prize. I didn't pay much attention to it because I was interested in something else at the time...

We have been doing some experiments using a mercury light source and filters for each wavelenght and a Detector Box (phototube) to measure the output voltage, to investigate planks constant, stopping voltage, intensity's effect... the typical - "energy is quantised" idea. :zzz: There is one...

I am just trying to wrap my mind around this. Einstein explained the effect using photons, but why couldn't the electron get stripped by a wave. I understand that the electron will not get stripped until the energy is high enough, but I don't understand why a wave could not be resonsible. It...

Bremsstrahlung is the process in which an accelerated electron radiates and loses energy in the form of a photon(production of continuous X-rays). In photoelectric effect, an atom absorbs a photon and an electron from one of the shells is ejected. So, is it reasonable to regard X-ray...

Im trying to get my head around a question in a book as i thought it would be good to give them ago as I am struggling. The question is: Explain why a metal plate does not lose its charge when; a) the plate is + charged and illuminated with visible light. b) the plate is - charged and...

hello from my understanding of the photo electric effect, the minimum workfunction must be met before electrons are emitted prior to that, intensity doesn't play a part. if the frequency is increased to juz above the work function and stays constant there and i increase the intensity...

Hi, Can someone point me to a treatment of the preferential direction of emission of a photoelectron in the case of polarized incident light ? I think that there is a relationship a la cos^2 theta between the plane of polarization of the light (E-field) and the probability of emission of the...

I have some questions regarding the first two sections Einstein's paper. I'd really appreciate some guidance. The paper can be found here: http://lorentz.phl.jhu.edu/AnnusMirabilis/AeReserveArticles/eins_lq.pdf In section 1 of the paper, he considers a volume of gas surrounded by...

How would I find the threshold frequency if the work function is 3.33eV? I know how to calculate minimum frequency.

what can be said about the work functions of two metals when the threshold wavelength in the photelectric effect increases. I'm having trouble finding and equation to describe this relationship. ANyone have any ideas?

So someone pointed me to a patent of Tesla's (or two, rather, but basically the same thing): * US Patent 685, 957: Apparatus for the utilization of radiant energy * US Patent 685, 958: Method of utilizing radiant energy (You need a TIFF viewer and then click on the "images" link.)...

The photoelectric equation is given by: hf = hf0 + 1/2mv2 where f is the frequency of the incident wave and f0 is the threshold frequency. HERE, only the conservation of energy is taken into consideration and momentum conservation is neglected. Why is this approach justified? Suppose we...

So i have this problem. An isolated copper sphere of radius 5.00cm, initially uncharged, is illuminated by ultraviolet light of wavelength 200nm. What charge will the photoelectric effect induce on the sphere? The work function for copper is 4.70 eV. Can someone help me conceptualize...

I have been recently studying the photoelectric effect and electron emission from metals. I am curious about how (if at all) this could affect the material properties of the metal, like the resistivity or stress/strain.

I'm working on a lab where I used LEDs of different wavelenths to record photocurrent they create when striking a metal. Using this data, i was able to find an equation relating the wavelength of the incident light to the current that is produced. My problem is that when I repeated the...

Photoelectric effect and moving from A to B... When originally reading about the photoelectric, i guess i was looking at the electrons a bit classically yet using the quantum model of the photon, but it did appear to make sense when concerning the work function. I thought that when it was...

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 is the differential cross section for photo-electric effect? Is there a paper that explains this in more detail? Thanks in advance for any responses!

How the Concept of Photoelectric effect proved that the light acts as a particle? Considering the fact that even the electron exist as waves, Can't the superposition of the light waves and the electron waves result in the ejection of the photo electron. Thanking you in advance.

When white light is radiated on a metal surface such as a zinc plate, do any of the zinc atoms emit any electrons? I know that only the high freq photons that are above the threshold freq such as ultra-violet do, but what confuses me now that I am thinking about it is that, of course white...

Light of intensity 2.0 W/ m^2 is incident on an aluminim surface. The wavelength of the light is 160nm. For aluminium the work function is 4.2eV. Find the kinetic energy of the slowest moving electrons So then Kmin would be the wavelength at which the cutoff frequency occurs, yes? e =...

Simple question: What happens to the energy of a photon that does not succeed in knocking off an electron??

What happens when you increase the frequency of the light incident on a metal surface? Does it increase the threshold frequency for the emission of photoelectrons? Does it increase the Kinetic energy of some energetic photoelectrons? I can't figure this out.

Hey people, I'm doing some last minute revision for my physics A-level (not literally last minute, i have a few days till the exam) and I need something clarifying. The photoelectric effect is supposed to demonstrate particle behaviour of light. From what I have read, the energy of the...

it state electron will be released from a metal surface if exposed to electromagnetic so i was thinking on a sunny day, a particular metal exposed to sun light one of the emf,, would the electron start to fly off the surface? if it does,? isn't this radiation? or it is...

Photoelectric effect question, help please, thanks! In the standard experiment the stopping voltage is measured for several wavelengths of incident light. In this apparatus the photocathode is metallic potassium. Suppose that the apparatus has not been used for some time and that its...

when UV light is shone upon a metal, can electrons be ejected from the metal or does this only occur if there is another force in play (eg a potential difference to sweep the elctrons away) also, if electrons (at their base energy level) only accept a specific frequency of UV light (which...

Most physics books says something like this on the photoelectric effect: "the photoelectric effect provided strong evidence of the particle nature of light - and it eventually led Einstein to propose that light consisted of discrete packets of energy (photons) in 1905." I have been told...

In an exam today the teacher asked "What does the photoelectric effect demonstrate" and the answers were "The wave nature of light", "The particle nature of light", "The dual nature of light" (i.e both)" and "Neither". I answered that it demonstrates the dual nature of light, but she insists...

This may seem like a stupid question, but i just can't get my head around it. Basically i was wondering why a mirror refless light. Of course the simple answer suggests that it just reflexs it back (the basic laws of optics). But then i was also thinking about the photoelectric effect and was...

What is the relationship between the maximum electric current and the intensity of incident light? -are the inversely proportional? What colour has the larges cutoff potential? -is it yellow? Is cutoff potential effected for violet light? -no? How do you calulate maximum kinetic...

I would like to know why, experimentaly, there is a difference between the maximum photocurrent with a yellow illumination (lambda = 580 nm) and other colors with a lower wavelenght like green or blue, respectively 546 and 404 nm. According to the theory, the max photocurrent does not depend of...

Can any1 explain this process and why it supposedly only works on metals.

Hi, I'm have a problem with photoelectric effect it states that we have a wavelength of 2.08*10^-7 falls on the photosurface, a voltage of 1.40V is required to stop the emitted electrons from reaching the anode. What is the largest wavelength of light which will result in emission of...

Doppler and photoelectric effect When using the doppler effect equations to determine the speed of celestial objects, what happens to the energy of the photons? If a certain device required a 600nm wavelenth of light and frequency 5E14 Hz to induce current, would photons from a celestial body...

how can i use photoelectric effect to do a in class presentation. hoe can i exploit this phenomenan to make something meaningful from physics point of view. please give appropriate suggestions.