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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.
answer is A.
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