Q. 14

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Answer :

Einstein’s photoelectric equation is expressed as:




Or,


Where, =maximum kinetic energy of the photoelectron.


=maximum velocity of photoelectron.


m= mass of emitted photoelectron.


= frequency of light radiation.


= work function.


= Planck’s constant.


If is the threshold frequency, then the work function can be written as,



According to the photoelectric equation,



--------- (i)


Let the maximum kinetic energy for wavelength of the incident be,


-------- (ii)


(Given)


From equation (i) and (ii), we get;








Work function is the energy required to eject photoelectron from the metal.




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