Question

In the arrangement shown in figure (42-E4), y =1.0 mm, d=0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. Find the stopping potential V needed to stop the photocurrent.

Answer 1

Given : fringe width,

y = 1.0 mm x 2 = 2.0 mm, D = 0.24 mm, W₀ = 2.2 ev, D = 1.2 m