Question

What is photoelectric effect ? what are the laws of photoelectric effect ? How did Einstein explain the observed fact of photoelectric effect ? ​

Answer 1

Explanation:

$phenomena \:photoelectric \: effect \: emission$

:- When light of suitable frequency illuminates a metal surface . these photo (light ) generates electrons are called photo electrons .

Explanation :- When an electron attempts to come out of metal the metal surfece aquires a positive change and pulls the electron back to the metal . the free electron is thus held inside the metal surface by attractive force of ions . A certain amount of energy is required by an electron to escape from the metal surface. this energy is called work function .

Law of photoelectric effect are following

(1) for a given material there is a certain minimum frequency of radiation has a frequency below this threshold , no photo electric emission ever take place .

(2) for incident frequency r greater than the threshold frequency , the photoelectric current is directly proportional to the intensity of radiation .

(3) the maximum kinetic energy of the photoelectrons is directly proportional to only the frequency incident radiation .

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Einstein observation is in this given picture .

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