![For the Love of Physics](/img/default-banner.jpg)
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For the Love of Physics
India
Registrace 14. 09. 2016
Hi, I am Dibyajyoti Das. My friends call me DJ (i know right :D), my students - DJ Sir, Dibya Sir, and colleagues - Mr. Das. (I am giving you these options, since I know you will have difficulty with my name - story of my life)
So, this is my YT channel. I love Physics, as you can tell, and this channel is devoted to everyone who loves this beautiful subject. I did my Masters in Physics from Indian Institute of Technology Kanpur (IITK), and then taught as Asst. Professor at HRC, Delhi University for 10 years (2013-2022). Currently I am the Director of Elevate Classes/ ElevateX
I hardly reply to mails and chats (one of my many demerits). Not because I don't want to connect with you, but because I am too self-absorbed most of the time. So, apologies in advance.
Thank you for reading all that. May God bless you all ! Take care :)
So, this is my YT channel. I love Physics, as you can tell, and this channel is devoted to everyone who loves this beautiful subject. I did my Masters in Physics from Indian Institute of Technology Kanpur (IITK), and then taught as Asst. Professor at HRC, Delhi University for 10 years (2013-2022). Currently I am the Director of Elevate Classes/ ElevateX
I hardly reply to mails and chats (one of my many demerits). Not because I don't want to connect with you, but because I am too self-absorbed most of the time. So, apologies in advance.
Thank you for reading all that. May God bless you all ! Take care :)
Particle in a 1D Box | Infinite Potential Well Problem in QM
The Infinite Potential Well problem is one of the most important and simplest problems in Quantum Mechanics. In this video, I do a complete discussion on the topic.
𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬
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Android ► bit.ly/3zU71ur
iOS ► apple.co/3ZPRWVJ (use ORG code - AHGXS)
𓏬𓏬𓏬𓏬𓏬LEC NOTES - GDRIVE𓏬𓏬𓏬𓏬𓏬
Find the PDF Scanned copy of my NOTES for this lecture here:
𓏬𓏬𓏬𓏬𓏬VIDEO DESCRIPTION𓏬𓏬𓏬𓏬𓏬𓏬
The particle in a box problem considers a single particle, such as an electron, trapped in a one-dimensional region between two impenetrable walls. The walls are so high that the particle cannot escape, meaning its potential energy is zero inside the box and infinitely large outside.
Wavefunction: In quantum mechanics, the state of the particle is described by a wavefunction. This wavefunction represents the probability amplitude of finding the particle at a specific position within the box. Inside the box, the wavefunction must meet certain boundary conditions: it must be zero at the walls of the box because the particle cannot exist outside the box.
Quantization: Unlike in classical mechanics, where the particle can have any energy, the particle in a box can only have specific, discrete energy levels. These energy levels are quantized and are determined by the size of the box and the mass of the particle.
Nodes and Antinodes: The wavefunction inside the box exhibits a pattern of nodes (points where the wavefunction is zero) and antinodes (points where the wavefunction has maximum amplitude). The number of nodes increases with the energy level, indicating higher energy states correspond to more complex wave patterns.
Energy Levels: The lowest energy state, called the ground state, has the simplest wavefunction with no nodes (except at the boundaries). Higher energy states, called excited states, have increasing numbers of nodes. The spacing between energy levels increases as the particle's energy increases.
This problem illustrates fundamental quantum mechanical principles, such as quantization of energy and the wave nature of particles. It also serves as a basis for understanding more complex systems in quantum mechanics, including atoms and molecules.
00:00 Introduction
01:53 Solution of Time Independent Schrodinger's Eqn
06:43 Boundary Conditions
10:48 Discrete Energy Levels
17:32 Normalization & Wavefunction
24:23 Visualization of Eigenfunction & Probabilities
30:07 Properties of Eigenfunction Sulutions
𓏬𓏬𓏬𓏬𓏬𓏬TELEGRAM𓏬𓏬𓏬𓏬𓏬𓏬
Join my Telegram Channel ► t.me/FortheLoveofPhysicsYT
𓏬𓏬𓏬𓏬𓏬SUPPORT CHANNEL𓏬𓏬𓏬𓏬𓏬
Your Financial support provides me an additional incentive to create high quality lecture videos. I am very much thankful for your generosity and kindness
Support/ Patreon ❤️❤️❤️www.patreon.com/dibyajyotidas
Donate/ Paypal 🔥🔥🔥 paypal.me/FortheLoveofPhysics
JOIN MEMBERSHIP in CZcams 😇😇😇
czcams.com/channels/OfLm6gZGt3vwTMKRg-irhg.htmljoin
𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬
Browse LIVE & Recorded Courses for Physics IITJAM, CSIR-NET, GATE, TIFR, JEST etc on our platform ► www.elevateclasses.in/
Android ► bit.ly/3zU71ur
iOS ► apple.co/3ZPRWVJ (use ORG code - AHGXS)
𓏬𓏬𓏬𓏬𓏬LEC NOTES - GDRIVE𓏬𓏬𓏬𓏬𓏬
Find the PDF Scanned copy of my NOTES for this lecture here:
𓏬𓏬𓏬𓏬𓏬VIDEO DESCRIPTION𓏬𓏬𓏬𓏬𓏬𓏬
The particle in a box problem considers a single particle, such as an electron, trapped in a one-dimensional region between two impenetrable walls. The walls are so high that the particle cannot escape, meaning its potential energy is zero inside the box and infinitely large outside.
Wavefunction: In quantum mechanics, the state of the particle is described by a wavefunction. This wavefunction represents the probability amplitude of finding the particle at a specific position within the box. Inside the box, the wavefunction must meet certain boundary conditions: it must be zero at the walls of the box because the particle cannot exist outside the box.
Quantization: Unlike in classical mechanics, where the particle can have any energy, the particle in a box can only have specific, discrete energy levels. These energy levels are quantized and are determined by the size of the box and the mass of the particle.
Nodes and Antinodes: The wavefunction inside the box exhibits a pattern of nodes (points where the wavefunction is zero) and antinodes (points where the wavefunction has maximum amplitude). The number of nodes increases with the energy level, indicating higher energy states correspond to more complex wave patterns.
Energy Levels: The lowest energy state, called the ground state, has the simplest wavefunction with no nodes (except at the boundaries). Higher energy states, called excited states, have increasing numbers of nodes. The spacing between energy levels increases as the particle's energy increases.
This problem illustrates fundamental quantum mechanical principles, such as quantization of energy and the wave nature of particles. It also serves as a basis for understanding more complex systems in quantum mechanics, including atoms and molecules.
00:00 Introduction
01:53 Solution of Time Independent Schrodinger's Eqn
06:43 Boundary Conditions
10:48 Discrete Energy Levels
17:32 Normalization & Wavefunction
24:23 Visualization of Eigenfunction & Probabilities
30:07 Properties of Eigenfunction Sulutions
𓏬𓏬𓏬𓏬𓏬𓏬TELEGRAM𓏬𓏬𓏬𓏬𓏬𓏬
Join my Telegram Channel ► t.me/FortheLoveofPhysicsYT
𓏬𓏬𓏬𓏬𓏬SUPPORT CHANNEL𓏬𓏬𓏬𓏬𓏬
Your Financial support provides me an additional incentive to create high quality lecture videos. I am very much thankful for your generosity and kindness
Support/ Patreon ❤️❤️❤️www.patreon.com/dibyajyotidas
Donate/ Paypal 🔥🔥🔥 paypal.me/FortheLoveofPhysics
JOIN MEMBERSHIP in CZcams 😇😇😇
czcams.com/channels/OfLm6gZGt3vwTMKRg-irhg.htmljoin
zhlédnutí: 3 051
Video
Free Particle in Quantum Mechanics
zhlédnutí 3KPřed měsícem
𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Browse LIVE & Recorded Courses for Physics IITJAM, CSIR-NET, GATE, TIFR, JEST etc on our platform ► www.elevateclasses.in/ Android ► bit.ly/3zU71ur iOS ► apple.co/3ZPRWVJ (use ORG code - AHGXS) 𓏬𓏬𓏬𓏬𓏬LEC NOTES - GDRIVE𓏬𓏬𓏬𓏬𓏬 Find the PDF Scanned copy of my NOTES for this lecture here: 𓏬𓏬𓏬𓏬𓏬VIDEO DESCRIPTION𓏬𓏬𓏬𓏬𓏬𓏬 In quantum mechanics, the wave function of a free particle...
Quantum Mechanics Explained in 2 minutes
zhlédnutí 3,5KPřed měsícem
What is Quantum Mechanics? What are it's most fundamental ideas, and how is it different from Classical mechanics? In this short video, I try to briefly give an explanation of the basic ideas of Quantum mechanics, and its features like - definite energy levels, position probability densities etc. I also talk about the concept of wavefunction superposition and the measurement problem. We can see...
Stationary States, Energy Levels, Superposition & Wavefunction Collapse
zhlédnutí 1,9KPřed měsícem
𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Browse LIVE & Recorded Courses for Physics IITJAM, CSIR-NET, GATE, TIFR, JEST etc on our platform ► www.elevateclasses.in/ Android ► bit.ly/3zU71ur iOS ► apple.co/3ZPRWVJ (use ORG code - AHGXS) 𓏬𓏬𓏬𓏬𓏬LEC NOTES - GDRIVE𓏬𓏬𓏬𓏬𓏬 Find the PDF Scanned copy of my NOTES for this lecture here: 𓏬𓏬𓏬𓏬𓏬VIDEO DESCRIPTION𓏬𓏬𓏬𓏬𓏬𓏬 In quantum mechanics, stationary states refer to quantum s...
Problem Solving in QM - Part II (Quick Revision for Competitive Exams)
zhlédnutí 2,1KPřed 2 měsíci
Solve these 8 Questions in Quantum Mechanics from the various topics of - VALID WAVEFUNCTIONS, NORMALISATION, PROBABILITY, SCHRODINGER’S EQUATION, EXPECTATION VALUES 2Q etc 𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Upcoming Batch: Physics IIT-JAM 2025, TIFR & JEST Batch starting JUNE 22 Upcoming Batch: CSIR-NET DEC 2024 & GATE-2025 Batch starting JUNE 30 Find all details here: Website ► www.elevateclasses.in/ ...
Course Launch at Elevate Classes | Physics IITJAM-2025, CSIR-NET DEC-2024 & GATE-2025
zhlédnutí 1,1KPřed 2 měsíci
𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Upcoming Batch: Physics IIT-JAM 2025, TIFR & JEST Batch starting JUNE 22 Upcoming Batch: CSIR-NET DEC 2024 & GATE-2025 Batch starting JUNE 30 Find all details here: Website ► www.elevateclasses.in/ Android ► bit.ly/3zU71ur iOS ► apple.co/3ZPRWVJ (use ORG code - AHGXS) Details of JAM BATCH: www.elevateclasses.in/IIT-JAM-Physics/Masterclass.html Details of NET Batch: www...
Problem Solving in QM - Part I (Quick Revision for Competitive Exams)
zhlédnutí 2,7KPřed 2 měsíci
Solve these 10 Questions in Quantum Mechanics from the various topics of - BLACKBODY RADIATION, PHOTOELECTRIC EFFECT, COMPTON EFFECT, DE-BROGLIE HYPOTHESIS, WAVE-PACKET GP/PH VELOCITIES, UNCERTAINTY PRINCIPLE, ATOMIC STRUCTURE etc 𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Upcoming Batch: Physics IIT-JAM 2025, TIFR & JEST Batch starting JUNE 22 Upcoming Batch: CSIR-NET DEC 2024 & GATE-2025 Batch starting JUNE 3...
Wave Function in Momentum Space
zhlédnutí 2,9KPřed 2 měsíci
What is the representation of Wave function in Momentum space, and the corresponding probability densities and expectation values? 𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Upcoming Batch: Physics IIT-JAM 2025, TIFR & JEST Batch starting JUNE 22 Upcoming Batch: CSIR-NET DEC 2024 & GATE-2025 Batch starting JUNE 30 Find all details here: Website ► www.elevateclasses.in/ Android ► bit.ly/3zU71ur iOS ► apple.co/3Z...
Probability Current
zhlédnutí 3,9KPřed 3 měsíci
What is Probability Current and it's Continuity Equation in Quantum Mechanics is what I discuss in this video lecture. 𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Browse LIVE & Recorded Courses for Physics IITJAM, CSIR-NET, GATE, TIFR, JEST etc on our platform ► www.elevateclasses.in/ Android ► bit.ly/3zU71ur iOS ► apple.co/3ZPRWVJ (use ORG code - AHGXS) 𓏬𓏬𓏬𓏬𓏬LEC NOTES - GDRIVE𓏬𓏬𓏬𓏬𓏬 Find the PDF Scanned copy of ...
EHRENFEST THEOREM | The BRIDGE between Quantum & Classical Physics
zhlédnutí 9KPřed 7 měsíci
What is the connection between Quantum & Classical Physics? Under what circumstances do the Schrodinger Equation give us the Newton's Laws? This is what we discuss in today's lecture - The Ehrenfest Theorem 𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Browse LIVE & Recorded Courses for Physics IITJAM, CSIR-NET, GATE, TIFR, JEST etc on our platform ► www.elevateclasses.in/ Android ► bit.ly/3zU71ur iOS ► apple.co/3...
Expectation Values of Position & Momentum | Basics of Probability Theory | OPERATORS
zhlédnutí 12KPřed 7 měsíci
What are Operators in Quantum mechanics? What is the Expectation value of Position, Momentum, Kinetic Energy, Total Energy etc? This is what we discuss in today's lecture. 𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Browse LIVE & Recorded Courses for Physics IITJAM, CSIR-NET, GATE, TIFR, JEST etc on our platform ► www.elevateclasses.in/ Android ► bit.ly/3zU71ur iOS ► apple.co/3ZPRWVJ (use ORG code - AHGXS) 𓏬𓏬𓏬𓏬𓏬...
Wavefunction & Normalization EXPLAINED
zhlédnutí 15KPřed 7 měsíci
What is a wavefunction in Quantum Mechanics? Does it have a physical significance? How do we know whether a given wavefunction is physically acceptable or not? Let's discuss all these questions in today's lecture. 𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Browse LIVE & Recorded Courses for Physics IITJAM, CSIR-NET, GATE, TIFR, JEST etc on our platform ► www.elevateclasses.in/ Android ► bit.ly/3zU71ur iOS ► app...
Born's Statistical (Probabilistic) Interpretation of Quantum Mechanics
zhlédnutí 10KPřed 7 měsíci
Born's Statistical Interpretation, a fundamental concept in quantum mechanics, states that the square of the wave function's magnitude at any point gives the probability density of finding a particle at that point. 𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Browse LIVE & Recorded Courses for Physics IITJAM, CSIR-NET, GATE, TIFR, JEST etc on our platform ► www.elevateclasses.in/ Android ► bit.ly/3zU71ur iOS ► ap...
SCHRÖDINGER'S EQUATION (Derivation) - Plausibility Argument & Time-Independent SE Derivation
zhlédnutí 26KPřed 7 měsíci
SCHRÖDINGER'S EQUATION (Derivation) - Plausibility Argument & Time-Independent SE Derivation
Laser Physics - Stimulated Emission & Einstein Coefficients | Three Level Laser
zhlédnutí 10KPřed 8 měsíci
Laser Physics - Stimulated Emission & Einstein Coefficients | Three Level Laser
Spectral Series & Atomic Transitions Explained | Success of Bohr Model
zhlédnutí 7KPřed 9 měsíci
Spectral Series & Atomic Transitions Explained | Success of Bohr Model
Structure of Atom | Bohr Model - Energy & Radius Calculations | e-Wave Quantization
zhlédnutí 9KPřed 9 měsíci
Structure of Atom | Bohr Model - Energy & Radius Calculations | e-Wave Quantization
Zero Point Energy | Virtual Particles | Bohr Radius | Spectral Width | Nuclear Electron
zhlédnutí 10KPřed 10 měsíci
Zero Point Energy | Virtual Particles | Bohr Radius | Spectral Width | Nuclear Electron
What is Uncertainty Principle? Wave Packet Approach - Fourier Transforms of Position/Momentum space
zhlédnutí 22KPřed 10 měsíci
What is Uncertainty Principle? Wave Packet Approach - Fourier Transforms of Position/Momentum space
Group & Phase Velocities of Wave packet in Quantum Mechanics
zhlédnutí 22KPřed 11 měsíci
Group & Phase Velocities of Wave packet in Quantum Mechanics
What is a Wave Packet in Quantum Mechanics?
zhlédnutí 27KPřed 11 měsíci
What is a Wave Packet in Quantum Mechanics?
Double Slit Experiment & 5 MIND BLOWING Predictions about Quantum Mechanics
zhlédnutí 20KPřed rokem
Double Slit Experiment & 5 MIND BLOWING Predictions about Quantum Mechanics
Davisson-Germer Experiment & Wave-Particle Duality
zhlédnutí 26KPřed rokem
Davisson-Germer Experiment & Wave-Particle Duality
De Broglie Hypothesis & Matter Waves | The Dual Nature of Matter & Radiation
zhlédnutí 24KPřed rokem
De Broglie Hypothesis & Matter Waves | The Dual Nature of Matter & Radiation
Something from Nothing: Pair Production & Pair Annihilation
zhlédnutí 28KPřed rokem
Something from Nothing: Pair Production & Pair Annihilation
Compton Effect Reveals the True Nature of Light | Derivation of Compton Equation
zhlédnutí 42KPřed rokem
Compton Effect Reveals the True Nature of Light | Derivation of Compton Equation
The Photoelectric Effect shows the Dual nature of light | What is a Photon?
zhlédnutí 30KPřed rokem
The Photoelectric Effect shows the Dual nature of light | What is a Photon?
Understanding Ultraviolet Catastrophe & Planck Postulate | The Birth of Quantum Mechanics
zhlédnutí 23KPřed rokem
Understanding Ultraviolet Catastrophe & Planck Postulate | The Birth of Quantum Mechanics
Planck Theory of Blackbody Radiation - Only Resolution to Ultraviolet Catastrophe! (DERIVATION)
zhlédnutí 30KPřed rokem
Planck Theory of Blackbody Radiation - Only Resolution to Ultraviolet Catastrophe! (DERIVATION)
Rayleigh Jeans Law & The Failure of Classical Physics
zhlédnutí 50KPřed rokem
Rayleigh Jeans Law & The Failure of Classical Physics
Thank you so much
THANKU VERY MUCH SIR🙏
Thank you. This was a helpful step by step derivation. The textbook I’m using was not showing a couple of crucial steps but it clicked with your video 😀
Great lecture
Hyperbollocks more like.
Great explanation ❤
Well explained sir ji,🙏🙏
Sir, please upload more videos.
Despite all the advancements in science, science decoded 3 forces perfectly out of 4 forces except gravity because, for this entire universe to happen, there must be 1 force before all other forces start all this. The science is perplexed as if gravity is a force or just the elasticity of the mass (therefore not a force). This is where science completely misses because gravity is the complete witness state, which is wholly steadfast in its center without any repulsion, and when we observe life and see if someone is steadfast in its center without any reactions, irrespective of the entire drama outside, we tend to gravitate towards the person. So, in a nutshell, gravity is a state of complete equanimity, which is defined in the Vedic traditions as Shiva (a symbolic explanation). If we read and understand Hindu mythology, we will come to know the basic mechanism of life without worshiping these mythological diets blindly. One needs to decode these mythologies.
Words cant express the value of this lecture. It can boost your confidence in the very first chapter of engineering physics.
Sir, the website link, please.
In the previous video you mention that energy levels can be degenerate. However, in the present video you state that an “energy level” for can have no more than two fermion occupants. It seems that it would be more precise to say that no more than two neutrons (protons) can correspond to the same “energy eigenstate”. As an analogy, the neon atom has six electrons at the same energy level in the 2p sub shell.
I have a doubt, when we consider an observer on the muon, why does he only observe length contraction ? and whether time dilates for him ?? I want to assure you whether that both the observers we took are at rest??
Great Video
Please make video on atomic and molecular physics
Since we have to ignore all points on the coordinate planes in k space, are the derived expressions less accurate for small values of mass number A?
In the many worlds interpretation, the other universes are part of our universe.
Consider a particle in a infinite square well potential of with two nanometer calculate the expectation value of particle's position in the ground state.
Incredible 👍💟💓
Can you please tell me the name of the simulation app you are using. I need it for my Math Exploration
Thank you so much sir was the best video on yt.Forever grateful
Tried the last section of your video with Gemini advanced version. It also found the normalization constant and the probability.
What a passion and energy level of the speaker.. his lectures are a boon for students..🙏
Thank you so much prof.Das, i am very excited to follow this beautiful course
That's all well and good, but what about a stream of electrons in free space with NO "conductor" to be "relative to" (as in a CRT)??? How does magnetism evolve from Special Relativity in that case?
Is there a possibility where annhaliation does not happen, another words the electron and positron separate and follow different paths?
Merci !
Total bullshit
Nice video. How would you justify the contraction observed by moving observer that is measuring/looking at the length in the stationary frame?
thank you
Opposite direction of course. Rotation or spin. Did you know the electron is made of 101 particles?
I'm a senior high school student from China and I really love your systemic videos, the time and the amount of episodes is moderate, not too long. In China we don’t have this kinda video. There’re only some videos of professional teaching videos of some universities that are too hard for me. No one make this kinda videos seriously. Appreciate you sir, I use VPN to watch your videos.
Very well explained. Thanks
Thanks a lot for this lecture series
Einstein was far ahead of his time. I never fully grasped the concept of gravity, let alone electromagnetism. With significant effort, it's possible to prove everything from the perspective of a relative frame of reference. However, what we observe in our own frame (on Earth) is what truly matters. Consider this theorem: A cat has nine tails. Proof: No cat has eight tails. A cat has one more tail than no cat. Therefore, a cat has nine tails.😂
I am not used to write a comment on CZcams videos but here I want to say thank you ❤ for this deep explanation. Thank you so much from the bottom of my heart
Thank u sir.
Thank u sir, great explanation about semi conductors use in measuring instruments keeping compact size in mind. Jussojuan
Pls use hinglish language or hindi can use audio 🔊 track in 1 vdo
Sir your name is Divyjoti 🙂 sachme aapne mere andr Jyoti jla di Gyan ki ❤😊
Great video and simplest way to explain. Thanks
Sir at 07:12, u wrote that particle emitted on beta minus decay is neutrino but I think that anti-neutrino should be there in beta minus decay. Also the particle emitted in second reaction should be neutrino.
Tranformation 🔥,🫡 😂😂 emoji is not comingg,,
Thank you so much for making the amazing videos
very well explained super interesting way
Sir next lecture plz..
Does an atom become an ion during beta and alpha decay? For example, with alpha decay, 2 protons leave, then the atom is negatively charged because of the extra electrons. Or are the electrons leaving too?