Scientist Influence on the photoelectric effect(what did they do and how did they influence the discovery?)​

Any color picture tube and electric field exerts a net force of magnitude 1.68x 10^-13 n on an electron the rest mass of an electron is 9.11 x 10^-13 what is the electron acceleration?

Auniform solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 33.4 rpm. what is its kinetic energy?

What would be the net charge of 1 gram gold piece after removal of 1% of its electrons