Published by:
CGP EDU Academic Team
Published on: September 12, 2026
The graph between 
and stopping potential (V) of three metals hvaing work functions 
and 
in an experiment of photo-electric effect is plotted as shown in the figure, Which of the following statement(s) is/are correct? [Here λ is the wavelength of the incident ray]
A
Ratio of work functions 
B
Ratio of work functions 
C
is directly proportional to hc/e, where h is Planck's constant and c is the speed of light. D
The violet colour light can eject photoelectrons from metals 2 and 3 .
Text Solution
Verified by ExpertsThe correct answer is:
C
For plate 1:
Plate 2
Plate 3
For plate 2, threshold wavelength-
For plate 3, threshold wavelength
since violet colour light λ is 400 nm, so 
for plate 2
so, violet colour light will eject photo-electrons from plate 2 and not plate 3.
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