This RU-vid channel contains a series of Physics videos which are intended to give a basic introduction to the subjects covered. They explain the essence of the subject in as simple as way as possible. They assume basic knowledge of algebra and calculus and some general physics.
UK A levels are broadly equivalent to USA AP/ SATs. UK GCSEs are broadly equivalent to US high school diploma.
Dr PhysicsA has a BSc (physics) and PhD (nuclear physics) from King's College, London.
Videos are organised into playlists:
A Level Physics Revision GCSE Physics Revision A Level Physics Exam Questions Examples Atomic Physics Electricity & Magnetism Particle Physics Thermodynamics Nuclear Physics Classical Mechanics Special & General Relativity Cosmology Quantum Mechanics Miscellaneous
You can get a full list of the contents of videos on this channel, organised into playlists, at www.bobeagle.co.uk/drphysicsa.html
I only got through half of the video 3 years ago and couldnt come back due to my studies. Now that I’ve graduated, I’m so glad to have found this video again as I remembered it explaining everything so well and clearly!
I swear this is the most accurate derivation on this I m glad that I found your channel.TYSM.........i might say u may not be alive or if you are then I really wanna thanks A LOT
Speed of light cannot be constant.... how can physics measure the speed of light by the very unit of measurement that light is supposed to be defining in the first place? And, we see things travel faster than light everyday and change their properties. I'm thinking of seeing quantum physics on our larger scale. Fire, for example, speeds up molecules fast enough for them to change their states. Maybe the double slit experiment isn't as strange as we think. Maybe it's our own brain that just doesn't know how to interpret exactly what it's "seeing" and it's giving us feedback the best way it knows how.
"In May and November, the Earth is moving at "right angles" to the line to Algol. During this time we see minima happening regularly at their 2.867321 day intervals. However, during August, the Earth is rapidly moving towards Algol at about 107,229 km/hr as explained on my How Fast Are We Moving? page. (The Earth moves approximately 202 times its own size in one day.) So in 2.867321 days the Earth moves about 7,379,039 km closer to Algol. _But the varying light from Algol doesn't know this - its light waves left Algol 93 years ago and are travelling at a constant speed._ The result - we "catch a bunch of minima early" during August as shown on Chart 2. Exactly the opposite happens during February - the Earth is moving away from Algol that fast and it takes longer for the group of minima to reach us so we see them taking longer between events. How long? 7,379,039 km divided by the speed of light 299,792.458 km/sec is 24.61382 seconds. So in May and November when we are not moving towards or away from Algol - the period seems constant. It is our rapid movement towards or away from the events in August and February that causes the timing differences." I assume that light is passing the earth at c when the earth isn't moving towards or away from Algol. In February the earth is moving away from Algol and the time between the eclipses is 2.8675875347 days and the light is passing the earth at 186,265 mi/sec. In May and November the earth is not moving towards or away from Algol and the time between eclipses is 2.867321 days and the light is passing the earth at 186,282 mi/sec. In August the earth is moving towards Algol and the time between eclipses is 2.8670608912 days and the light is passing the earth at 186,299 mi/sec.
The triangle of lights paradox. There are 3 lights in the form of a triangle. A, B, and C are lights and are stationary with respect to each other. S1, S2, S3 are spaceships. S1 is moving from B towards A. S2 is moving from C towards B. S3 is moving from A towards C. A, B, and C flash simultaneously in the frame of reference that is at rest relative to these lights. So in the frame of reference of S1, A flashes first followed by B flashing. In the frame of reference of S2, B flashes first followed by C flashing. In the frame of reference of S3, C flashes first followed by A flashing. So the sequence of flashing is A, B, C, A. But wait! A flashed first. How can it flash last? How can A flash both first and last? It only flashed once in the frame of reference that is at rest relative to these lights. Therefore there is a paradox.
The 2 ships paradox. Ship1 at rest at top: T--------------------N <----- N----------T Ship2 at rest at bottom: T----------N -----> N--------------------T The moment when T1 is lined up with N2 must be the same moment in both frames of reference because there is only 1 moment when this occurs. There was some point in the past when N1 was lined up with T2 according to ship 1 but not according to ship 2. That is impossible thereby proving that special relativity is nonsense.
8:34 "p is quantized" - this equation says that rp is integral. it does not say that p is integral. (r is not a constant - r can change when an electron switches orbits).
8:24 "r is the radius and that is a constant" - lol :) what??? if r is a constant then p cannot change. because m certainly cannot change. then if v changes, then we are no longer balancing coulom's law. lol :)
@ 00:37 MB-distribution deals molecules or atoms; both are distinguishable. @ 10:51 Not the number of molecules, but the number of molecules PER energy-interval (dE)
4:16 "standing wave" - incorrect. (from chatgpt) "A standing wave is a wave pattern that appears to stay in a fixed position rather than traveling through a medium. It occurs when two waves of the same frequency and amplitude, traveling in opposite directions, interfere with each other. This interference creates a wave that oscillates in place, with certain points remaining stationary (nodes) and others experiencing maximum oscillation (antinodes)."
I aspired to be a physicist as a child, Isaac Newton was my childhood hero. but my interests switched completely to other fields (politics, etc.). When I was 16, I watched this lesson and learnt basics of general relativity from it. Then I became interested in physics/mathematics again. Throughout the years, I've read hundreds of papers, books, and learnt hundreds of theories, but this video started it all. Thank you for starting the most wonderful journey of my life.
Aren't the derivatives partials instead of normal ones? You are differentiating with respect to x, despite having a t, another variable, in the equation. What am I missing here?
A brilliant lecture like all the others I have seen so far. But I have an objection. As Einstein said, it is not possible to squeeze matter indefinitely since for this to happen, particles need to move at the speed of light. Einstein is correct, because after crushing everything to the last lepton you get radiation alone which is equivalent to what Einstein said. Noe radiation behaves like a gas because it has momentum and when confined exerts a force on the confining boundary due to reflection and momentum reversal. This pressure has no limit as it depends on radiation intensity and there is no limit for this as radiation is a boson. regards.
Thanks for a very clear explanation, though I would have liked if you would have explained the XOR gate using circuits with emitter and collector (similar to the previous gates) instead of directly using 4 NAND gates to explain it. 😌
In Kochers experimental version of this EPR paradox he admits that although the beams themselves are unpolarised, the light arriving at both detectors WILL be same polarised as long as their path lengths are equal. He then admits that he crosses the filters at the 2 detectors. Preventing same polarised states of light from getting to both detectors simultaneously. Seeing as he admits that the light arriving at both detectors will always be in the same polarised state but one detector will always have its light blocked because of the crossed filters. And yet despite this being obviously a simple matter of blocking light from going to both detectors simulataneously with crossed filters. Kocher pretends this simple sleight of hand is QT magic!!
14:48 my brain suddenly blurted out "van de Waals?" and now I'm wondering if the valence quarks inside the nucleons could deform their position probabilities for something to happen there. Just another physics crackpot lol.
