The graph between $1 / \lambda$ and stopping potential (V) of three metals having work functions $\phi_1, \phi_2$ and $\phi_3$ in an experiment of photo-electric effect is plotted as shown in the figure. Which of the following statement(s) is/are correct? [Here $\lambda$ is the wavelength of the incident ray].
Select ALL correct options:
A
Ratio of work functions $\phi_1: \phi_2: \phi_3=1: 2: 4$
B
Ratio of work functions $\phi_1: \phi_2: \phi_3=4: 2: 1$
C
$\tan \theta$ 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.
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