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

Can you explain thermistor, Can you explain thermistor? Write short notes o...

Can you explain thermistor? Write short notes on back emf and internal resistance of a cell.

P-type semi conductor, What are the minority and majority charge carriers i...

What are the minority and majority charge carriers in a p-type semi conductor? How is a battery connected to a junction diode in a) forward and b) reverse-bias?

Infra-red detectors and optic lens, Infra-Red (IR) Detectors:   An IR ...

Infra-Red (IR) Detectors:   An IR detector has an impedance of Z= (400+j200) ?  . During design  tests the detector  current  is measured  as  4  µA. What  is  the output v

Illustrate how are amps and watts related, Q. Illustrate how are amps and w...

Q. Illustrate how are amps and watts related? Answer:- In a nutshell the power calculated in watts dissipated by a resistance is directly proportional to the square of the

What do you mean by length contraction, Q. What do you mean by Length Contr...

Q. What do you mean by Length Contraction? The length of any object in a moving frame will appear for shortened in the direction of motion. The amount of contraction can be cal

Nuclear physics, #question.law of successive disintegration and conditions ...

#question.law of successive disintegration and conditions of radioactive equilibrium?

Gravitational field, what is Gravitational field at a distance r from the i...

what is Gravitational field at a distance r from the infinitely long rod with liner mass density d?  Please drive it Ans) use Gauss'' law of electrostatics, but replace (1/4πε0)

Cph has rest mass, CPH has rest mass, so how it explained by relativity? ...

CPH has rest mass, so how it explained by relativity? Answer; never can we see CPH at rest condition. CPH moves faster than light.

Illustrate the reflection of waves at closed and open ends, Write down the ...

Write down the condition for the construction of good auditoria. Illustrate the reflection of waves at closed and open ends.

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