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.
An electron travels at a speed of 2.0 x 10^6 m/s in a magnetic field of 0.5 T. Calculate the force experienced by the electron. (Given: Charge of an electron = -1.6 x 10^-19 C)