Q. 6

# In an experiment

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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