5 µC negative charge sitting in an electric field moves away from the source charge. The electric potential difference of the moving charge is measured as 1J/C. How much work or energy was added to the system to get the charge to move.

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct