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

Entropy and second law of thermodynamics, Show that the heat transferred du...

Show that the heat transferred during an in nitesimal quasi-static process of an ideal gas can be written as dQ = Cv nR V dP + Cp nR PdV: Apply this equation to an adiabatic proces

Similarities in construction of MOSFET and JFET, Similarities in Constructi...

Similarities in Construction of MOSFET and JFET (i)  JFET is a three terminal semiconductor device (source, drain and gate) in which current conduction is by majority carriers

Electric potential, is the surface of a conductor is equipotential

is the surface of a conductor is equipotential

Determine the power supplied to the load, A single-phase transformer has a ...

A single-phase transformer has a voltage ratio of 6:1 and the h.v.winding is supplied at 540V. The secondary winding gives a full load current of 30A at a power factor of 0.8 l

Homework, An ostrich can run at speeds of up to 72km/h. Suppose an ostrich ...

An ostrich can run at speeds of up to 72km/h. Suppose an ostrich runs 1.5km at the speed of 58 km/h and then runs another 1.5km at the speed of 29km/h. What is the ostrich average

Electromagnitism, a rectangular box with edges located at (0,0,0); (a,0,0);...

a rectangular box with edges located at (0,0,0); (a,0,0); (0,b,0) and (0,0,c) is half-filled from z=0 up to z=c/2 with a dielectric with constsnt e. the top half is empty. the cove

Compute the thickness of the film, Q. A light of wavelength 6000 0 A falls ...

Q. A light of wavelength 6000 0 A falls normally on a thin air film, 6 dark fringes are seen between two points. Compute the thickness of the film. 2μt = nλ Thickness of t

SHM, composition of two simple harmonic motions at right angles to each oth...

composition of two simple harmonic motions at right angles to each other and having time periods in the ratio 1:2

Electric field intensity, A negative point charge 10 -8 coulomb is located...

A negative point charge 10 -8 coulomb is located in air at the origin of a rectangular coordinate system. What is the electric field intensity at a point on the positive x directi

Explain unit of capacity, Unit of Capacity: The unit of capacity of a c...

Unit of Capacity: The unit of capacity of a capacitor is known as farad (f). It is given by a relation. q = cv.

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