Why is a metal piece heated up when cathode rays strike it?
When cathode rays strike a metal plate, their kinetic energy is transformed into heat energy, which increases the temperature of the plate.
A beam of electrons is accelerated through a potential difference of 500 V. Determine the final kinetic energy of an electron if its initial kinetic energy was 100 eV. (Given: Elementary charge e = 1.6 x 10^-19 C)