A charged particle enters a magnetic field and initially is moving anti-parallel to the B-field. Which of the following statements about the charge's motion is true? 1) The charge moves in a circular orbit
2) The magnitude of the velocity does not change with time
3) The direction of the velocity does not change with time

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