Using Einstein.s photoelectric equation show that photoelectric emission is not possible if the frequency of incident radiation is less than the threshold frequency

Draw a graph showing the variation of stopping potential with frequency of incident radiation Mark the threshold frequency in the figure.

The de Broglie wavelength (lamda) associated with photoelectron varies with frequency (nu) of the incident raidation as [ nu_(0) = threshold frequency]

Einstein got Nobel prize in physics in 1921 for his explanation of photoelectric effect. Draw a graph to show the variation of stopping potential with frequency of incident radiation. How the value of Plank.s constant can be deter mined from the graph?