The surface of cesium is illuminated with monochromatic light of various wavelengths and the stopping potential for the wavelength are measured. The results of this experiment is plotted as shown in the figure Estimate the value of work function of the cesium and Planck's constant.

Answer

`2eV, 6.53 xx 10^(-34) J-s`

Explanation

We, have `eV_(0), (hc)/lambda -phi=hv-phi implies V_(0)=(hv)/e-phi/e`
from graph, `phi/e=2Vimplies phi=2eV`
Also slopes of the graph `=(2)/(0.49xx10^(15))=h/e`
`implies h=(2xx1.6xx10^(-19))/(0.49xx10^(15))=6.536xx10^(-34) J//sec`