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.
Comments