Answer :

Photoelectric equation


eV0 = hv - ϕ0 ………… eq.01


Where e = Charge on an electron = 1.6 × 10-19 C


V0 = Stopping Potential


h = plank’s constant


v = frequency of photon


ϕ0 = Work function of the metal


Rewriting equation no. 1


V0 = hv/e - ϕ0/e ………………………………equ.02


h/e is slop of the line represented by above equation02.


Therefore h/e = slop of the line = 4.12 × 10-15 Vs


h = 1.6 × 10-19 × 4.12 × 10-15 = 6.594 × 10-34 Js


Value of plank’s constant ‘h’ from above experiment is equal to 6.594 × 10-34 Js.


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