Question

the work function of a photosensitive material is equal to 1.8eV, find out threshold frequency and threshold wavelength​

Answer 1

Answer:

01.8eV=1.8×1.6×10−19J,  

λ=5000Å =5000×10−10m

Threshold frequency,

v0=ϕ0h=1.8×1.6×10−196.63×10−34=

= 4.363×1014Hz

Threshold wavelength,

λ0=cv0=3×1084.363×1014

=6.875×10−7m

Hope it helps u !!