Q. 243.7( 3 Votes )

Figure in the plot of the stopping potential versus the frequency of the light used in an experiment on photoelectric effect. Find (a) the ratio h/e and (b) the work function



Answer :

from the above graph we see that,

When =1.656V then …… (1)


When =0 then …. (2)


Where the stopping potential and ν is the frequency


Of the light.


From Einstein’s photoelectric equation,



….(3)


from eq (1) & (3) we have


….. (4)


Again from eq(2) & (3) we have


…… (5)


On solving eq (4) & (5) we get



Work function,


Now, to find the ratio h/e we put the value of Ф


In eq (5) we get,





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