PLEASE HELP!!! ASAP!!
One student heated a metal wire to produce high-speed electrons. When the electrons struck a metal target, waves were produced in a direction perpendicular to the motion of electrons as shown in the diagram below.
What does the student's experiment most likely demonstrate?
high speed electrons can produce longitudinal waves
electrons moving at high speed produce electromagnetic waves
the direction of longitudinal waves is perpendicular to motion of electrons
the direction of electromagnetic waves is always towards the pull of gravity
