Parth G | Physics Giveaway: 10k Subscribers - THANK YOU! @ParthGChannel | Uploaded 4 years ago | Updated 1 hour ago
A bloke talks about physics and gets 10k subs. Who would have thought? In this giveaway, you can win a book! More specifically, my first physics book. Read on for more info...

Hey everyone, this is not one of my usual videos explaining a physics concept. Instead, I just quickly wanted to take some time and thank every single one of you that has subscribed to my channel. I am constantly in shock and awe as to just how many people are finding my Maxwell's equation video (link: https://www.youtube.com/playlist?list=PLOlz9q28K2e6aNgl1zt1xccyy4Ofl3YAk ), and just how many people seem to enjoy the videos.

We've suddenly smashed through the 10k subscriber barrier and the past few weeks have been extremely crazy! I have to acknowledge all the people who have left nice and/or supportive comments on my videos because it means a lot to me. You guys all rule. Additionally, I also want to acknowledge all the brilliant people who have given me constructive criticism in the comments on my videos, because you're helping me make better videos and that's exactly what I want to do. Thank you!

I have lots of future video ideas, so stick around if you're a physics enthusiast like me, or even if you hate physics and want to try and work out what the appeal is. I want to finish off my Maxwell's Equations series, alongside returning to Physics Explained in 1 Minute, and my analyses of various fictional worlds, from the perspective of a physicist. Aside from this, I also want to make a few less serious videos, such as the ones I've made reviewing physics memes.

Also, in this video I wanted to do a giveaway to thank all of you for joining this journey. I'm giving away the book that I first read that got me interested in physics. It's called "Dead Famous: Albert Einstein", and it's quite apt I think. What a better way to celebrate a wonderful milestone, than to look back at where it all began? I've already made a video talking a bit about this book so check it out here: https://www.youtube.com/watch?v=ysCyoJ0PEzs&t=10s

Also, if you enjoyed my vlogs back in the day (or if you want to watch my vlogs now) then head over to IGTV and follow me on Instagram @parthvlogs

Thanks so much once again, and I'll see you soon

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$Diffraction: Why Does It Happen? (Physics Explained for Beginners)$ $Relativistic Momentum and Common Sense - Why Physics Theories are Counterintuitive Momentum in Classical Mechanics looks different to Momentum in Special Relativity. But why is that? Hey everyone, Im back with another video! This time were using Relativistic Momentum, and Classical Momentum, as examples to talk about why certain tricky to understand theories (e.g. Relativity and Quantum Mechanics) happen to be the best descriptors we have right now of the universe. Firstly, lets start with the basic idea that classical physics is generally considered intuitive to most people. The objects described by this branch of physics end up behaving like our day-to-day experiences, and our expectations, tell us they should. But classical physics famously breaks down when considering objects moving at large velocities. Anything that moves at a considerable fraction of the speed of light needs a relativistic description. And special relativity really is mind-bending, introducing ideas that dont make intuitive sense to most people, such as the constancy of the speed of light, time dilation, length contraction, etc. But heres the thing: before the advent of relativity, humans were not used to very fast-moving objects. So we did not have a good grasp of how objects should behave at those speeds, or even the fact that the speed of these objects made any difference. Interestingly, when we consider the expression for (special) relativistic momentum, we know that its a good descriptor of the motion of objects moving at all speeds. And when we consider the motion of objects at speeds that we are used to in day-to-day life, we find that the special relativistic momentum expression actually reduces to the classical expression. In other words, at low velocities, classical and relativistic momentum looks the same! This is why classical physics derived the equation that p = mv (momentum = mass x velocity), rather than p = mv/sqrt(1-(v/c)^2), where c is the speed of light, taken to be a constant in relativity. This kind of logic is used as a little test for many complicated theories by the way. If any theory is a complicated and counterintuitive one, we can ask the question. does our theory reduce down to classical physics under the right conditions?. This is because in these specific conditions, classical physics is indeed a good description of the universe. So our weird new theory agreeing with this is only a good thing. If the two theories disagree, then this is not a huge problem - we need to try and work out why. When we apply this logic to quantum physics, a principle known as the Correspondence Principle pops up. In the limit of large quantum numbers, quantum systems must look like classical systems. In simplified terms, quantum mechanics describes very very small systems excellently. And this behaviour, when extended to much larger systems, must agree with the behaviour that we happen to observe - distinctly classical behaviour, which is why we came up with classical mechanics in the first place. I also wanted to use a nice little analogy to represent our understanding of the universe from a classical perspective, and how subsequent mind-bending. weird theories encompassed classical physics and yet described even more of the universe. So I put in some trains! Thanks for watching this video! If you enjoyed it, please do hit the thumbs up button and feel free to subscribe. Check out my second channel here: https://www.youtube.com/channel/UCLneiIR_ivuWYuJzGVRoZLA Follow me on Instagram @parthvlogs. Ill see you soon!$

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