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.
http://learn.flvs.net/webdav/assessment_images/educator_ess_v11/ouruniverse/aou001.jpg
What does the student's experiment most likely demonstrate?

Question

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. 
http://learn.flvs.net/webdav/assessment_images/educator_ess_v11/ouruniverse/aou001.jpg
What does the student's experiment most likely demonstrate?

iwik · Answer

1 high speed electrons can produce longitudinal waves
2 electrons moving at high speed produce electromagnetic waves
3 the direction of longitudinal waves is perpendicular to motion of electrons
4 the direction of electromagnetic waves is always towards the pull of gravity

anonymous · Answer

maybe one or three