Photoelectric effect, Physics

Assignment Help:

Photoelectric effect

An effect described by A. Einstein that demonstrates that light appears to be built up of photons or particles. Light can do excite electrons (called photoelectrons in this context) to be ejected through a metal. Light along below frequency a sure threshold, at any particular intensity, will not cause any photoelectrons to be emitted from the metal. Above that particular frequency, photoelectrons are emitted in proportion to the intensity of incident light.

The cause is that a photon contains energy in proportion to its wavelength, & the constant of proportionality is the Planck constant. Below a firm frequency and therefore below a certain energy -- the incident photons do not have enough energy to knock the photoelectrons out of the metal. Above that threshold energy, called the work function, photons will knock on the photoelectrons out of the metal, in proportion to the number of photons (the intensity of the light). On to higher energies & frequencies, the photoelectrons ejected get a kinetic energy corresponding to the difference among the photon's energy and the workfunction.


Related Discussions:- Photoelectric effect

Flashlight, what make flashlight suddenly become dim or bright when you sh...

what make flashlight suddenly become dim or bright when you shake it?

Explain phenomenon of scattering, Some phenomenon based on scattering: (...

Some phenomenon based on scattering: (i) Sky looks blue because of scattering. (ii)  At the starting time of sunrise or sunset sun looks reddish. (iii) Danger signals are

Explain the energy and mass, Explain the Energy and Mass Albert Einstei...

Explain the Energy and Mass Albert Einstein described an intricate relationship between matter and energy.  It is summarized in the famous formula: E = mc 2   In this equ

Construction & chemical action of cell, Construction & chemical action of C...

Construction & chemical action of Cell: In cells, an electrolyte separates two charge collecting materials called electrodes, to which external connections are made. The electr

Find charge parity - thermodynamics, Find Cp for any substance in terms of ...

Find Cp for any substance in terms of V, T, P and S. Hint: How is C p related to (∂s/∂T) p ?

Increased speed by using a pulley, Using a pulley Use the pulley set-up...

Using a pulley Use the pulley set-up shown in experiment A 12. Apply the force on the movable pulley and get how rapidly the weight on the other end of the string rises.

What is the hardness of water, What is the hardness of water? How is it exp...

What is the hardness of water? How is it expressed? Hardness is the property of water which stops lather formation with soap. This is because of the presence of certain salts o

Explain elastic scattering, When the wavelength of wave remains unchanged, ...

When the wavelength of wave remains unchanged, the scattering is known as elastic.

Determine the working of n- channel JFET, Determine the working of N- Chann...

Determine the working of N- Channel JFET In N-channel JFET, two p regions are connected with each other (internally or externally) and are called gate (G). Ohmic contacts are

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd