Cathode rays are an unknown phenomenon. One experiment to prove that cathode rays are not electromagnetic waves. That cathode rays actually have mass. So, this video is suitable for those of you who want to prove the mass properties of cathode rays.
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LearningTranscript
00:00The following is an illustration of the apparatus to explain one of the properties of cathode rays in this tutorial.
00:10The first component is a closed glass tube.
00:14The air inside has been pumped out.
00:17So inside the tube, there is a vacuum, or has very low air pressure.
00:23It can also be called a gas discharge tube.
00:27The metal plate on the top left is connected to the negative pole of a DC voltage source, called the cathode.
00:35The metal plate on the top right is connected to the positive pole of the DC voltage source, referred to as the anode.
00:44Inside the tube, there is a wheel made of light metal.
00:49When all electrical circuits have been connected and turned on,
00:53the wheel in the tube starts to rotate and moves translationally to the right, or towards the anode side.
01:07How could this happen?
01:12Okay, we will simplify the equipment into the following.
01:16A cathode.
01:17A pinwheel.
01:19There are two possibilities here.
01:21The first possibility is that cathode rays are ordinary electric light or electromagnetic waves.
01:28When electromagnetic waves touch the blades on the wheel, these waves will be reflected or absorbed by the blades,
01:34in accordance with the laws of reflection and refraction of light.
01:38The pinwheel won't turn or move.
01:41This is not in accordance with the observation results.
01:44So cathode rays are not electromagnetic waves.
01:47The second possibility is that cathode rays are particles that have mass.
01:52When an object with mass having a certain speed touches an object with another mass that is at rest, a collision process will occur.
02:00This causes a change in momentum on the blade.
02:03So the blade has speed towards the right.
02:06Because the center of mass of the wheel is on the axis, then the wheel will rotate while moving translationally to the right.
02:13This is in accordance with the results of observations.
02:19So cathode rays are actually the movement of particles with mass from the cathode to the anode.
02:25Later known as electrons.
02:29Thank you for watching the video on this channel.
02:33And, don't forget to watch the next video.