\nResearch assignment: Teach me about spin. Below there are suggested questions, recommended sources and my social media accounts: QUESTIONS: Questions that require less research: 1. This is our first real example of quantization, the...\nResearch assignment: Teach me about spin. Below there are suggested questions, recommended sources and my social media accounts: QUESTIONS: Questions that require less research: 1. This is our first real example of quantization, the phenomena that gives quantum mechanics it's name. Here's what it means. In the classical case of magnets going through a Stern Gerlach machine, the magnets can end up any where in the range. But in quantum mechanics, its can only be exactly up or down, these discrete values rather than a continuous range in between. This sort of quantization really bothered physicists. Can you understand why? And is there any classical physics phenomenon that also has sort of quantization? 2. Do you think that eventually all quantities in physics can be explained in terms of deeper physics? Are there any examples of quantities that later on did get explained through a more encompassing theory? 3. How can you use the Stern-Gerlach machine to measure spin in the 'forward-backward' direction? 4. Why do half the particles go left, half right at 4:24? Questions that (probably) require research: 5. What are bosons and fermions? What's spin got to do with it? 6. Electrons are so-called spin 1/2 particles. Are there any other spin types? What determines what spin a particle will have? 7. How does spin relate to the Pauli exclusion principle? 8. Explain how the Stern-Gerlach machine works. 9. Is light polarization a type of spin? What are arguments for and against this? What spin does a photon have (spin 1/2, spin 1 etc)? 10. Why is it that charged particles moving causes magnetic fields- according to Einstein? (Look up relativity and electromagnetism) 11. What's wrong with saying the electron is infinitely small? What experiments measure the electrons size? Are protons also infinitely small? 12. Find other reasons we don't believe electrons are actually spinning. (An interesting one is about rotating a spin particle 360 degrees, and not getting back the exact same wavefunction.) 13. a) What is the Bloch Sphere, and why can we use it to represent spin? How do you visualise the spin left state on it? how about spin forward? b) Also, How do you write spin forward in terms of up and down (i.e. |forward)=a|up)+b|down))? You will probably need to look this up, so it's useful to know the spin \"up/down\"ness is usually called spin in the z direction, spin \"left/right\"ness is spin in the x direction, and spin \"forward/backward\" is spin in the y direction. You can figure this out by looking at the Bloch sphere. 14. Magnetic Resonance Imaginging (MRI) is an important clinical technic that completely relies on manipulating spin. Explain it! 15. What happens to the electrons if you put them into the Stern-Gerlach machine and then slowly rotated from up and down to side and side, do some of the electrons switch places? (Thank you Majoofi) 16. Why arent there magnetic monopoles? (Thanks Culwin) 17. What is isospin? Why is it that, even though it hasnt got the units of angular momentum, it still formally acts like spin? according to Wiki? (Thanks Hythloday71)\n
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