The Cathode Ray Propagation
How to prove the direction of movement of cathode rays? Here we have a device consisting of a vacuum tube. In the vacuum there is "cross maltase". It turns out that the image shape of this "maltase cross" can predict the shape of the trajectory of the cathode ray propagation.
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LearningTranscript
00:00Following is an illustration of the apparatus to explain cathode ray propagation.
00:09The first component is a closed glass tube.
00:12The air inside has been pumped out,
00:15so that the tube is empty or has very low air pressure.
00:20It can also be called a gas discharge tube.
00:24The metal plate on the top is connected to the negative pole of the DC voltage source, called the cathode.
00:35The metal plate at the bottom is connected to the positive pole of the DC voltage source, referred to as the anode.
00:43Inside the tube, there is a cross-shaped barrier maltase.
00:47It also made of metal plates.
00:50When all electrical circuits have been connected and turned on,
00:54at the end of the tube opposite the cathode, it glowed greenish.
01:02But strangely, the glass in the form of cross-maltase is clean, from luminescence.
01:08Why does this happen?
01:13To explain this phenomenon, we will place three components, namely a light source,
01:17a barrier, and a screen.
01:22Since we cannot see the movement of the cathode ray directly, we will take three assumptions.
01:28The first assumption, a parabolic path.
01:32This trajectory is similar to a kicked ball.
01:36We have already introduced this trajectory in the parabolic motion course.
01:41It turns out that on the screen, almost all parts can be reached by the light.
01:46The beam can easily turn past a barrier.
01:49This is not in accordance with the results of observations.
01:53Thus, the cathode ray does not move in the parabolic path.
01:58The second assumption, the path of the ray, is a sinus or cosine.
02:04This trajectory is similar to waves on the surface of the sea.
02:08We already know this trajectory in mechanical waves.
02:11Almost the same as the first assumption, almost all parts of the screen can be reached by light,
02:16especially if it has an amplitude exceeding the height of the barrier.
02:20This is not in accordance with the results of observations.
02:24Thus, the cathode ray does not move in the sinus or cosine path.
02:31The third assumption, the path of the ray, is a straight line.
02:35This track is similar to a train track.
02:37This track is similar to a train track.
02:41We already know this trajectory on a straight line motion course.
02:47Rays that hit the barrier will not be transmitted,
02:51so that the back of the barrier will not pass through the light.
02:56There is a shadow in the form of Maltese cross,
02:59because no light reaches this area.
03:01This is consistent with the results of observations.
03:05Thus, the cathode ray moves in a straight line.
03:11Yup, I hope this tutorial can provide useful benefits.
03:15And, don't forget to like, share, and subscribe.