Discharge Tubes : Demonstrated and the physics principles behind them
What are discharge tubes?
And how does gas pressures determine effects when high voltage is applied across them?
Watch the video that was important in the exploration of cathode rays that eventually led to the discovery of the electron by JJ Thomson
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Пікірлер: 16
thank you so much for this video, i could now (finally lol) understand a bit more of this. loved that :)
Great video I’m new to all this so thanks for explaining
Thanks so much, it will do work this time. I hope we will get higher quality video sooner later.
great video, really helpful
@PhysicsHigh
4 жыл бұрын
Glad it was helpful!
6:00 I think the other tube glowing is not solely due to the induction, but the UV light exciting the the atoms in the other tube. Otherwise, it would be glowing while the tube before that was electrified.
I read that Helium glows yellow orange when ionozed, but under some conditions can glow green or blue? what conditions would those be? very interesting video
Good
PLease go into the physics of the banding.
😍😍😍
Why we needed high voltage
Looks like lightsabers
A fine demonstration except for one thing... it can't be mercury in the tubes. Mercury is of course a liquid at room temperatures and so its vapor pressure in a glass tube like this is solely a function of the temperature of the tube at any given time. In other words, there is no way to control the pressure of an array of tubes like this at room temperature if they're using mercury as the discharge medium, aside from actually passing different currents through them which would eventually heat them to differing degrees. Also, the color is totally wrong for mercury which should be a pale sky blue. This must be either argon or air or something in these tubes. It has to be a gas at room temperature whatever it is. You are a physics teacher, so I know I don't have to tell you what the easiest way to find out what's actually in there is!
@PhysicsHigh
2 жыл бұрын
Thanks. They were the original tubes that I found at the school which were labeled as such. I never questioned them. I now need to investigate.
@Muonium1
2 жыл бұрын
@@PhysicsHigh 👍🏻 I will guess.....argon! let me/us know when you find out!
@AlexThompson171
Жыл бұрын
@@PhysicsHigh @Muonium1 I was glad to find this comment because I recognised mmHg ("millimetres of mercury") as a unit of pressure... but couldn't have explained the conundrum so eloquently! I believe blood pressure is/was measured in mmHg since it was literally an indication of how high the liquid mercury would be lifted against gravity as a result of the pressure in a tube..? (still not sure what the gas in the tube is... I would've guessed it's just air?)