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

Lens maker equation, what is the physics principle involved in the lens mak...

what is the physics principle involved in the lens maker equation

What is a p-n junction, What is a P-N junction? How does it behave under fo...

What is a P-N junction? How does it behave under forward and reverse bias?  Describe with the help of circuit diagrams.

Show the equilibrium under a flexible exchange rate, Q. Under fixed exchan...

Q. Under fixed exchange rate, show using a figure, the effects of an expansionary fiscal policy. Show the equilibrium under a flexible exchange rate. Discuss the difference in t

What do you mean by alloy, Q. Explain an alloy? Answer:- An alloy ...

Q. Explain an alloy? Answer:- An alloy is a homogeneous hybrid of two or else more elements at least one of which is a metal and where the resulting material has metallic

What is electric flux, What is electric flux? Write its S.I. units. Usin...

What is electric flux? Write its S.I. units. Using Gauss's theorem, assume an expression for the electric field at a point because of a uniformly charged infinite plane sheet.

Physical significance of gradient of a scalar function, Explain the physica...

Explain the physical significance of gradient of a scalar function?

What are the merits of semiconductor diode over vacuum diode, What are the ...

What are the Merits of Semiconductor Diode over Vacuum Diode: (i)  Smaller in size (ii) Greater efficiency (iii) Cheaper (iv) Robust

Describe the radiation resistance of an antenna, a. Describe the radiation ...

a. Describe the radiation resistance of an antenna. b. With sketch, explain the feed mechanism of a parabolic reflector c. Explain the given term:- (i) Horn Antenna (ii

Calculate the optimal values of area and flow rate of water, The heat-rejec...

The heat-rejection system for a condenser of a steam power plant is to be designed for minimum first plus pumping cost. The heat-rejection rate from the condenser is 14MW. The foll

Define about the heat loss, Define about the Heat Loss? An immersion h...

Define about the Heat Loss? An immersion heater of power J=500 W can be used to heat water in a bowl. After 2 minutes the temperature enhance from T 1 =85 o C to T 2 =90°C. Th

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