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

Energy levels of this molecule, The microwave (rotational) spectrum of 12 ...

The microwave (rotational) spectrum of 12 C 16 O having  a series of lines spaced by 115.3 GHz. Suppose that the rotational  energy levels of this molecule can be approximated by

Why capacitor blocks d.c. but allows a.c., Q. A capacitor blocks d.c. but a...

Q. A capacitor blocks d.c. but allows a.c. Why? Capacitive reactance   XC = 1/ω C        = 1 / 2πν C Where ν is the frequency of the a.c. supply. In a d.c. circuit

Huygens principle, Huygen's principl e : Huygen's principle states that eve...

Huygen's principl e : Huygen's principle states that every point of a wave front behaves as the source of small secondary wavelets which spread out in all directions with a velocit

Carbon film resistor, MANUFACTURING: Pure carbon is deposited...

MANUFACTURING: Pure carbon is deposited on ceramic substrate by thermal decomposition of hydrocarbon at 1000 0 C. The sheet resistance of film is controlled by contro

What is raman shift, Q. What is Raman shift? In 1928 Sir C.V. Raman fi...

Q. What is Raman shift? In 1928 Sir C.V. Raman fined out experimentally that the monochromatic light is scattered when it is allowed to pass through a substance. The scattered

What do you mean by magnetic induction? , Q) What do u mean by magnetic ind...

Q) What do u mean by magnetic induction? what is the dimensioin of magnetic induction? Ans) Electromagnetic induction is the manufacture of a potential difference (voltage) acro

Time Period, what is the time period of a liquid in U tube ?

what is the time period of a liquid in U tube ?

Michelson morley experiment, Michelson Morley Experiment The Michelson...

Michelson Morley Experiment The Michelson-Morley experiment was performed within the year of 1887 through Albert Michelson and Edward Morley at what is presently Case Western

Coulomb law in vector form, What is the position vector of point c in equil...

What is the position vector of point c in equilateral triangle?

Compute the flux through the coil, Q. A coil of area of cross section 0.5 m...

Q. A coil of area of cross section 0.5 m 2 among 10 turns is in a plane perpendicular to a magnetic field of 0.2 wb / m 2 . Compute the flux through the coil.

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