It takes 261 kj/mol to eject electrons from a certain metal surface. what is the longest wavelength of light (nm) that can be used to eject electrons from the surface of this metal via the photoelectric effect?

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.