Answer:
Green, Blue and Violet colors.
Explanation:
Due to the photoelectric effect, a material emits electrons if electromagnetic radiation falls on it, usually visible light or ultraviolet rays. The frequency of the electromagnetic radiation must be greater than the frequency threshold of the material in order to photoelectric effect take place. Colors that have a greater frequency than [tex]5.7*10^{14} Hz[/tex] are:
Green: Between [tex]5.26*10^{14} Hz[/tex] and [tex]6.06*10^{14} Hz[/tex]
Blue: Between [tex]6.06*10^{14} Hz[/tex] and [tex]6.68*10^{14} Hz[/tex]
Violet: Between [tex]6.68*10^{14} Hz[/tex] and [tex]7.89*10^{14} Hz[/tex]
