Question

3. Representing the stopping potential V along y-axis and 1 along x-axis for a given photocathode, a the curve is straight line, the slope of which is equal to hc he 1) ec hc 2) 3) 4) h с​

Answer 1

Answer:

The Einstein's equation for photoelectric effect is given by , K  

max

​

=hν−W

or eV=  

λ

hc

​

−  

λ  

0

​

 

hc

​

 where λ= wavelength of absorbed photon and λ  

0

​

= threshold wavelength.  

So, V=  

eλ

hc

​

−  

eλ  

0

​

 

hc

​

   

Comparing this equation with general equation of straight line y=mx+c, we get slope, m=hc/e