The graph between 1λand stopping potential (V) of three metals having work functions ϕ1,ϕ2 and ϕ3 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].
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a
Ratio of work functions ϕ1:ϕ2:ϕ3=1:2:4
b
Ratio of work functions ϕ1:ϕ2:ϕ3=4:2:1
c
tan θ is directly proportional to hc, 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.