Positively brilliant sir! The E/M tubes we used in my undergrad physics class in 1975 were not as versatile as today apparently. Certainly no electrostatic deflection plates were included to achieve forces in quadrature. The only item missing might be a means to defocus the beam to a sufficient diameter to demonstrate Z Pinch. So very important in constricting the hot channel in lightning whilst the rapid thermal expansion in attempting to blow the ions radially away. Thus the production of temperature in the many 10s of thousands of degrees K. This of course provides oxides of nitrogen, currently considered pollutants, but green plants might beg to differ!
Thanks David and glad you liked the video. I think these Teltron tubes are about 40+ years old and may just have been around in your time but they were expensive! I have a number of them and I certainly used them in school in the 1980s. Yes, they were capable of showing so may different properties of electrons. Electron diffraction in a school lab is one of my favourites! You might have seen this little demonstrated use too: th-cam.com/video/7hJxn4l47X8/w-d-xo.html Thanks for watching and taking the time to comment!
Yes, it leads to some interesting effects and has quite a few applications as well. Though charged particles moving in the Sun's and Earth's magnetic fields are the biggest examples!
Thanks, and glad you enjoyed it. I find that helix and spiral seem to be used interchangeably but I like to get it right! Have a think about next time you go up a helical staircase!
Agreed, I think much of the confusion comes from a helix viewed along its axis of direction and with perspective appears as a spiral and that is often how we see a helix in day to day life. @@AnthonyFrancisJones
Yes, a 2D projection does result in a spiral and the etymology of helix is from 'spiral object' or similar! If you want a fun one it is the 'miss saying' of Helicopter too! It never was a heli-copter!
Brilliant demonstration! This is so exciting and awesome. We have this topic in our textbook and it seemed kinda scary but now I absolutely understand and admire it. Sir, you are an amazing teacher. I intend to watch all of your videos. You make physics enjoyable and bring the textbook concepts to life through your experiments.Your passion encourages the students to work harder. You are very kind, humble and dedicated. I am so happy to have discovered this channel😃.
Thanks again - I value all of your comments and it is especially pleasing to hear that the films are useful to your studies. I thought this was a great demonstration to do and one that I have not seen demonstrated before. That aside, it is just really pretty too! Keep working hard and you will achieve great things with your enthusiasm I am sure.
Another nice cathode ray demonstration there. It’s great how the added low-pressure gas, in these didactic tubes, let you see the beam path. I was also staggered by the similarity in the technique being demonstrated to a video I also uploaded today! Must be some quantum entanglement going on 😆.
Thanks - yes, I think this is a demonstration that is rarely, if ever, done with these tubes. I made it about a year ago and it has been waiting all that time for me to upload it. Must have a look at yours and see what you have been up to. Got a few more 'Teltron' videos in the bank and I need to film the Perin Tube one too at some stage. All good fun, however niche!
Hello, I would like to ask whether it would be possible to observe electron spin effects with such an apparatus with an inhomogenous magnetic field? Maybe if you were put the Helmholtz coils in opposite direction to get a uniform gradient and either adjust the current or move the coils so that the electrons go around in a circle and have a longer path to react to the field.
Good question - you are referring to the Stern-Gerlach experiment which this apparatus is not really suited to at all due to it's poor electron velocity selection, size and magnetic field magnitude. We do a version of this to find e/m for electrons but it would be pretty much impossible to see any electron spin effects being visible in this type of set up. Here is a link to my video on this th-cam.com/video/7hJxn4l47X8/w-d-xo.html Thanks for watching and a great question.
@@AnthonyFrancisJones thank you for your reply. Would it even be possible to observe electron spin effects in an electron beam? I’m thinking that with slow enough electrons and a strong magnetic field gradient, with the electrons traveling in the part where the magnetic field is zero, it should in theory be possible and the effects from their charge and spin could become comparable. Now that I’m thinking about it, doing such an experiment would most definitely not be easier to just get a turbomolecular pump and try the SG experiment, but that’s not possible for me and I would really love to play around with some quantum strangeness for myself, since it’s honestly quite hard to believe that it truly works the way we are taught. Do you know about any such experiments, which are possible to perform at home with a “student’s budget” which would allow me to observe the quantum world?
Good question, SG spin is not at all easy to observe and I do not know of any school experiment that would demonstrate this clearly. The ones I always think of when I think of the quantum duality of electrons and photons are the photo electric effect and diffraction/interference. I demonstrate these here: th-cam.com/video/xGWMmhfPqhM/w-d-xo.html and th-cam.com/video/ZSWKsmznzRk/w-d-xo.html Of course there is determining the Planck Constant with LEDs which is nice too: th-cam.com/video/XKJYUVensqw/w-d-xo.html I am really impressed by your enthusiasm. Are your lecturers/teachers giving you any help or access to equipment? Let us know how you get on.
@@AnthonyFrancisJones again, thank you for your response. Yes, I know about electron diffraction, a property coming up from QM, but I’ve already used the LEED method, but in my opinion it is not as impressive as observing and maybe playing around with quantum states like spin, where the states have a finite basis. I would for example love to see the beam start in the |+z> state, then go through a |+x> and |-x> split and then observe the |+z> again, but see the state change to |+z> and |-z> after blocking either |+x> and |-x>. We have practical measurements and next semester I can choose between these and mathematical analysis, but the SG experiment only has one pair of coils, so this effect won’t be observable and writing the protocols is really exhausting, so I will probably sign up for the analysis. Maybe the best (and free) way to play around with these finite basis states is to learn to program a quantum computer and try to upload your programs to IBM, but you only get the results without any contact to the device and the magic of seeing it happen in front of your own eyes has to be amazing:)
Thanks Jan, sounds like you are on a great course there with lots of opportunity. I wonder if there is a research team that you can visit and get them to show you what they are up to. Who know, you might join them in the future. Yes, quantum effects are amazing and I always say to my young school students that it is incredible that we can demonstrate quantum effects in a school laboratory and that includes ones that gained Nobel Prizes like the photoelectric effect. Good luck with your studies. Sounds great!
Please consider supporting my work by buying me a coffee at
www.buymeacoffee.com/francisjonesa
Very many thanks, F-J
Positively brilliant sir! The E/M tubes we used in my undergrad physics class in 1975 were not as versatile as today apparently. Certainly no electrostatic deflection plates were included to achieve forces in quadrature. The only item missing might be a means to defocus the beam to a sufficient diameter to demonstrate Z Pinch. So very important in constricting the hot channel in lightning whilst the rapid thermal expansion in attempting to blow the ions radially away. Thus the production of temperature in the many 10s of thousands of degrees K. This of course provides oxides of nitrogen, currently considered pollutants, but green plants might beg to differ!
Thanks David and glad you liked the video. I think these Teltron tubes are about 40+ years old and may just have been around in your time but they were expensive! I have a number of them and I certainly used them in school in the 1980s. Yes, they were capable of showing so may different properties of electrons. Electron diffraction in a school lab is one of my favourites! You might have seen this little demonstrated use too: th-cam.com/video/7hJxn4l47X8/w-d-xo.html Thanks for watching and taking the time to comment!
I have never seen this demonstrated before or even considered an electron beam in a near Parallel magnetic field. Quite spooky. Thanks.
Yes, it leads to some interesting effects and has quite a few applications as well. Though charged particles moving in the Sun's and Earth's magnetic fields are the biggest examples!
Funny Tony, TH-cam is telling me I did not reply to you but I am sure it shows below!
Excellent explanation thank you. You forced me to double check the difference between a spiral and a helix, obvious when you think about it :)
Thanks, and glad you enjoyed it. I find that helix and spiral seem to be used interchangeably but I like to get it right! Have a think about next time you go up a helical staircase!
Agreed, I think much of the confusion comes from a helix viewed along its axis of direction and with perspective appears as a spiral and that is often how we see a helix in day to day life. @@AnthonyFrancisJones
Yes, a 2D projection does result in a spiral and the etymology of helix is from 'spiral object' or similar! If you want a fun one it is the 'miss saying' of Helicopter too! It never was a heli-copter!
Brilliant demonstration! This is so exciting and awesome. We have this topic in our textbook and it seemed kinda scary but now I absolutely understand and admire it. Sir, you are an amazing teacher. I intend to watch all of your videos. You make physics enjoyable and bring the textbook concepts to life through your experiments.Your passion encourages the students to work harder. You are very kind, humble and dedicated. I am so happy to have discovered this channel😃.
Thanks again - I value all of your comments and it is especially pleasing to hear that the films are useful to your studies. I thought this was a great demonstration to do and one that I have not seen demonstrated before. That aside, it is just really pretty too! Keep working hard and you will achieve great things with your enthusiasm I am sure.
@@AnthonyFrancisJones Thank you so much
Another nice cathode ray demonstration there. It’s great how the added low-pressure gas, in these didactic tubes, let you see the beam path. I was also staggered by the similarity in the technique being demonstrated to a video I also uploaded today! Must be some quantum entanglement going on 😆.
Thanks - yes, I think this is a demonstration that is rarely, if ever, done with these tubes. I made it about a year ago and it has been waiting all that time for me to upload it. Must have a look at yours and see what you have been up to. Got a few more 'Teltron' videos in the bank and I need to film the Perin Tube one too at some stage. All good fun, however niche!
Hello, I would like to ask whether it would be possible to observe electron spin effects with such an apparatus with an inhomogenous magnetic field? Maybe if you were put the Helmholtz coils in opposite direction to get a uniform gradient and either adjust the current or move the coils so that the electrons go around in a circle and have a longer path to react to the field.
Good question - you are referring to the Stern-Gerlach experiment which this apparatus is not really suited to at all due to it's poor electron velocity selection, size and magnetic field magnitude. We do a version of this to find e/m for electrons but it would be pretty much impossible to see any electron spin effects being visible in this type of set up.
Here is a link to my video on this th-cam.com/video/7hJxn4l47X8/w-d-xo.html Thanks for watching and a great question.
@@AnthonyFrancisJones thank you for your reply. Would it even be possible to observe electron spin effects in an electron beam? I’m thinking that with slow enough electrons and a strong magnetic field gradient, with the electrons traveling in the part where the magnetic field is zero, it should in theory be possible and the effects from their charge and spin could become comparable.
Now that I’m thinking about it, doing such an experiment would most definitely not be easier to just get a turbomolecular pump and try the SG experiment, but that’s not possible for me and I would really love to play around with some quantum strangeness for myself, since it’s honestly quite hard to believe that it truly works the way we are taught.
Do you know about any such experiments, which are possible to perform at home with a “student’s budget” which would allow me to observe the quantum world?
Good question, SG spin is not at all easy to observe and I do not know of any school experiment that would demonstrate this clearly. The ones I always think of when I think of the quantum duality of electrons and photons are the photo electric effect and diffraction/interference. I demonstrate these here: th-cam.com/video/xGWMmhfPqhM/w-d-xo.html and th-cam.com/video/ZSWKsmznzRk/w-d-xo.html Of course there is determining the Planck Constant with LEDs which is nice too: th-cam.com/video/XKJYUVensqw/w-d-xo.html I am really impressed by your enthusiasm. Are your lecturers/teachers giving you any help or access to equipment? Let us know how you get on.
@@AnthonyFrancisJones again, thank you for your response. Yes, I know about electron diffraction, a property coming up from QM, but I’ve already used the LEED method, but in my opinion it is not as impressive as observing and maybe playing around with quantum states like spin, where the states have a finite basis. I would for example love to see the beam start in the |+z> state, then go through a |+x> and |-x> split and then observe the |+z> again, but see the state change to |+z> and |-z> after blocking either |+x> and |-x>.
We have practical measurements and next semester I can choose between these and mathematical analysis, but the SG experiment only has one pair of coils, so this effect won’t be observable and writing the protocols is really exhausting, so I will probably sign up for the analysis.
Maybe the best (and free) way to play around with these finite basis states is to learn to program a quantum computer and try to upload your programs to IBM, but you only get the results without any contact to the device and the magic of seeing it happen in front of your own eyes has to be amazing:)
Thanks Jan, sounds like you are on a great course there with lots of opportunity. I wonder if there is a research team that you can visit and get them to show you what they are up to. Who know, you might join them in the future. Yes, quantum effects are amazing and I always say to my young school students that it is incredible that we can demonstrate quantum effects in a school laboratory and that includes ones that gained Nobel Prizes like the photoelectric effect. Good luck with your studies. Sounds great!