1. Work function of A, Φ01 – hν01.
Work function of B, Φ01 – hν02.
2. The slope of the graph gives value of h/e.
3. For the metal A, hν1 = hν01 + eV1 ……(1)
For the metal B, hν1 = hν02 + eV2 ……..(2)
From equation (1) and (2)
hν01 + eV1 = hν02 + eV2
e(V1 – V2) = h(ν02 – ν01)
\(\frac{h}{e} = \frac{V_1-V_2}{v_{02}-v_{01}}\)