In an experiment on photoelectric effect, the slope of the cut off vol

1.	In an experiment on photoelectric effect, the slope of the cut off voltage versus frequency of incident light is found to be 4.12 × 10-15 Vs. Calculate the value of Planck’s constant.
Answer» Given, slope of graph = 4.12 × 10^-15 Vs since, slope of graph = \(\frac{h}{e}\) ∴ h = e × slope of graph = 1.6 × 10^-19 × 4.12 × 10^-15 = 6.59 × 10^-34Js

In an experiment on photoelectric effect, the slope of the cut off voltage versus frequency of incident light is found to be 4.12 × 10-15 Vs. Calculate the value of Planck’s constant.

Answer»

Given, slope of graph = 4.12 × 10^-15 Vs

since, slope of graph = \(\frac{h}{e}\)

∴ h = e × slope of graph

= 1.6 × 10^-19 × 4.12 × 10^-15

= 6.59 × 10^-34Js