Question

what is photoelectric effect??
explanation for photoelectric effect given by Einstein!!

Answer 1

hell... ooo!!

The phenomenon of ejection of electrons from the surface of a metal when light of Suitable frequency strike on it is called photoelectric effect.
The emitted electrons are called photoelectrons.
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Explanation for photoelectric effect

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Einstein by using planks quantum theory of electromagnetic radiation gave the explanation for photoelectric effect.

when a photon having sufficient energy strikes on electrons on the metal atom. it transfers ita energy instantaneously to the electron during the collision and electrons gets ejected without any delay.

Greater the energy possessed by the photons, greater will be the transfer of energy to the electron and greater will be the K.E possessed by the photoelectrons.

The energy which is supplied by the photon to the to the electron is used to set up to eject the electron from the metal atom and the remaining is used to eject electron with maximum K.E.

Energy of striking photon = threshold energy + K.E of the ejected electron

Energy of striking photon = hv from planks quantum theory..
Binding energy = threshold energy (hv°)

therefore, hv = hv° + 1/2 MeV^2

application for photoelectric effect
1. used to produce sound in cinematography
2. uesd in blugar alarms
3. used in automatic opening and closing of doors

hope this helps you.....!!!

Answer 2

The photoelectric effect appears when matter releases electrons upon vulnerability to electromagnetic radiation, such as a particle representing a quantum of light.

hν = W + E

h = Planck's constant
ν = the frequency of the incident photon
W=  work function

 an electron from the surface of a given metal: hν0
E = max. kinetic energy of emitted electrons: 1/2 mv2

ν0 = approached frequency for the photoelectric effect

m = rest mass of the emitted electron
v =  speed of the emitted electron

E = [(pc)2 + (mc2)2](1/2)

 m = rest mass of the particle 

 c = velocity of light in a vacuum.