Abhi Physics | UPSC Physics

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Booklist for Physics Optional ======= Paper 1 ======= Mechanics 1. Mechanics by DS Mathur 2. Mechanics & Properties of Matter, by AB Gupta 3. Classical Mechanics by JC Upadhayay Waves and Optics 1. Optics by Brijlal and Subramanian 2. Optics by Satya Prakash Electrodynamics 1. Electricity and Magnetism by Satya Prakash 2. Electromagnetic theory and Electrodynamics by Satya Prakash Thermal and Statistical physics 1. Thermal Physics by Garg, Bansal and Ghosh ====== Paper 2 ====== Quantum Mechanics 1. Quantum Mechanics by MC Jain 2. Advance quantum mechanics by Satya Prakash Atomic and Molecular physics 1. Atomic and Molecular spectra - by Rajkumar 2. Molecular spectroscopy by M Banwell Nuclear and Particle Physics 1. Nuclear and Particle physics by DC Tayal 2. Introduction to Nuclear and Particle physics by Mittal, Verma and Gupta Solid state physics, electronics and devices 1. Solid State Physics by Puri and Babbar 2. To be told later Note - These books in the best of knowledge and direct research, have been found to be most effective for the preparation. These books will help you the most for effective completion of the syllabus for at least ~80-90% of the syllabus. I understand that there are many recommendations, but there is no respite in the case of physics. ✓ Side by side, occasionally you will have to consult some other books.

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again one more See, you need to solve important problems as well

Griffiths again in action. Direct question from Griffiths. see question 7(b) of paper 1 2023

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Let us understand this year's Nobel Prize in Physics In physics we simply observe and study nature. So, this time we wanted to study electrons. To study them we need to observe electrons. But electrons movement or changes in their energy level happens very very fast. So, we have trouble observing them. Observation can be made when we send some probe (em wave maybe) to what is being observed! ============ Let us first observe a fast moving wings of bird, just for general understanding. When you observe a bird, you see blurred wings. The image is blurred because your low level camera can't capture each frames faster than a limit. So, you get a camera with faster shutter speed. Which means it can click or record pictures as fast as it can. That means, if a bird's wing is flapping 80 times in a second, then your camera must be able to click a picture in at least (1/80)th second. ========= Camara or any probe in physics, works on by capturing em wave (visible or maybe infrared). But we know wavelengths of light have a limit of around 300nm to 700nm). And with such limit we can't observe something which is much faster than that. Just recall, that you can't measure a width of a hair, by normal scale in your home. In similar manner, you can't measure something which happens for extremely small amount of time (like electrons change in energy level), without having faster probe. In nutshell, till now we could observe something which changes within a few femtosecond. 1 fm = 10 to the power -15 But what if it happens even in shorter amount of time than a femtosecond!! Answer we need even faster probe. That is a pulse which lasts for extremely short event of time. ============ The solutions lies in production of extremely small amount of pulse, to probe such extremely short event. Hence by combining different waves of shorter wavelength, we could produce even shorter wavelengths pulse. {see: principle of overtones}

example: from 0.00025 and 0.00020, if we want to get even shorter result we could multiply them to get 0.00000005. And in reverse, we could get larger result to by diving them. first no divided by second gives 1.25

this analogy is just a mathematical manipulation to give you an overview.

So, by combining various waves in way, they even got shorter wavelength pulse, which lasted for an attosecond {10 to the power -18} of time. This groundbreaking demonstration, will allow us to study quantum world better.

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Simulators complete 2023 It contains error free compilation of questions asked in UPSC CSE Main. Find the Simulators here =========== What's new: 🚀No error in question 🚀Original Figures used 🚀Covers 2011 to 2023 🚀Original Equations displayed 🚀Classification of conceptual and numerical type question

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question 5c of paper 1

Hope, that CERN people never says that. 😄

🚀 Solution of Paper 1 Section A is out Feedback, corrections are welcome.