A) Red
B) Blue
C) Green
D) Violet
Correct Answer: D
Solution :
Order of wavelength of given coloured lights are \[{{\lambda }_{v}}<{{\lambda }_{b}}<{{\lambda }_{g}}<{{\lambda }_{r}}\] Similarly, frequency order of these coloured lights are \[{{f}_{v}}>{{f}_{b}}>{{f}_{g}}>{{f}_{r}}\] Thus, energy order of these lights are \[{{E}_{v}}>{{E}_{b}}>{{E}_{g}}>{{E}_{r}}\] Therefore, violet light can produce photo electrons.
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