Please I really need help with this

If you want to create an electrical current, which situation would produce a solution capable of this

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) in an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

If a solution had a ph of 7 what is the solution