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Dual Nature Of Radiation And Matter

Physics
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The graph between and stopping potential (V) of three metals having work functions and in an experiment of photo-electric effect is plotted as shown in the figure. Which of the following statement(s)  correct? [Here is the wavelength of the incident ray].

A
Ratio of work functions : : : 2 : 4
B
Ratio of work functions : : : 2 : 1
C
is directly proportional to , where is Planck's constant and is the speed of light.
D
The violet colour light can eject photoelectrons from metals 2 and 3.
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