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

Direction south to north, An alpa particle is directed vertically upward wi...

An alpa particle is directed vertically upward with a speed of 3 X 104 Km/Sec in a region where a magnetic field of magnitude 1 Tesla exists in the direction south to north. Determ

Is the fiber end important, Is the fiber end important? So far as the a...

Is the fiber end important? So far as the actual light output the fiber termination has little affects on the overall light output. However, it is very important; while at the

Vector, Find the resultant of two vectors defined as A=6km east B=8km nort...

Find the resultant of two vectors defined as A=6km east B=8km north

How the scattered electrons form strong diffraction pattern, Davisson and G...

Davisson and Germer scattered electrons from a crystal of nickel. The scattered electrons formed a strong diffraction pattern. What significant conclusion was drawn from thi

What is defect, Defect: The image is formed behind the retina and lens ...

Defect: The image is formed behind the retina and lens becomes converging.

Optical, Ask question #Minimum 4. Determine the strength of a lens needed ...

Ask question #Minimum 4. Determine the strength of a lens needed to allow a person with a far-sighted eye with a near point of Pnar= 2.0 m (near point means the closest distance f

Uniform magnetic field, A positively-charged subdivision is moving southwar...

A positively-charged subdivision is moving southward in a downward-directed uniform magnetic field. The magnetic force is the merely force if any acting on the particle. Throughout

How do you calculate tensile strength, How do you calculate tensile strengt...

How do you calculate tensile strength? Tensile strength isn't really measured; it's calculated. It is explained as the point at which a sample of material fails when subjected

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