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Physics is the science of Nature and Time; As a science, it tries to describe Nature as precisely as possible, from its most tiny little details to its whole, the Universe. Apart from the description, it also tries to understand the “why”. Why is Nature the way it is, and not any other way?
Physics is the study of motion and the relationships of objects to each other. It is also the study of forces that act upon objects. Many of these forces seemed mysterious until Isaac Newton came up with a system to describe the various phenomena that mankind was aware of, but couldn’t quite comprehend. Why would a rock, when thrown, return to the earth? What was compelling it? Or even more mysterious: why did some earth materials seem attracted to each other, and would adhere to each other, while others didn’t? Physics has answered all these questions.
Branches covered under Physics
The below topics are listed as essential areas of study for one to be granted undergraduate physics degree status by the UK Institute of Physics, in no particular order of importance :-
- Newtonian mechanics
- Quantum mechanics
- Statistical mechanics
- Experimental methods
- Condensed matter
- Mathematical methods
The following is also taught to a lot of students :-
- Fluid dynamics
- Introductory computer programming
Each area must cover certain aspects, for example in quantum mechanics one must be able to understand the derivation of the Schrödinger equation in spherical coordinates and apply it to the hydrogen atom, and in condensed matter one must be able to understand how and why some materials can conduct electricity and others cannot, and why some conductors are better than others (it involves quantum mechanics and an understanding of electron configurations around the atom).
Classical Physics/ Mechanics
Classical Physics is a broad area of study and starts from Newton’s laws of motion, and goes on to include variational principles(Lagrangian equations of motions), Hamiltonians and symmetries and conservation laws. It also needs to include rotational dynamics, in between.
Electromagnetism is the theory that explains the close relationship between electric and magnetic fields. Variations in an electric field produce variations in the associated magnetic field, which then produce variations in the electric field, and so on. These variations are called electromagnetic waves, and they propagate outward at the speed of light. Depending on the frequency of vibration of the electrons producing the field, these EM waves are called :
- radio waves
- infrared light
- visible light
- ultraviolet light
- Gamma rays, or
- cosmic waves,
in order of increasing frequency, in cycles per second, or Hertz (Hz).
Thermodynamics is a beautiful and immensely powerful theoretical approach to understand and quantify transformations of energy and matter. It is a core subject in Physical Chemistry and a solid understanding of thermodynamics is pretty much essential for any branch of physics, physical chemistry, materials science, mechanical engineering, and chemical engineering.
It is not a subject that you can simply learn once and immediately master (at least not for me!). I’ve taught graduate and undergraduate thermo for 20 yrs and I’m still surprised by its subtilties.
There are three Laws of Thermodynamics.
The First Law is simply a statement of accounting, that the total energy of the system + environment is conserved. More precisely, it says that in order to change the total energy of a system you either need to do work, add heat, or change the size of the system :-
Note that the + before δw denotes work done ON the system as opposed to work done BY the system. Different texts and authors use + or – and you need to be aware of this…especially since professors like me tend to slip this issue into exam questions. The fall back is to always think about the answer you just computed!
The Second Law concerns a quantity called Entropy. This is probably the most confusing concept in thermodynamics. Broadly, it states that the total entropy can never decrease over time for an isolated system. Mathematically, we can see from the 1st law, that for an isolated system at constant volume, we have that δq=TdS, i.e that S=δq/T . That is to say that the change in entropy (at const. V) for a reversible process is the heat added to the system divided by the temperature at which it is added. This can be generalized to irreversible processes (Clausius inequality) which is to say that for a cyclic process.
The equality holds for a reversible process since S is a state function and changes in S depend upon only the initial and final state and not the pathway. Note that the Second Law also defines (precisely) the temperature of a system as
The Third Law is often stated that for a system at equilibrium the entropy of a perfect crystal at absolute zero of temperatures is exactly zero. This statement (like the Second Law) has been revised and revisited over the past 150 yrs.
“Quantum mechanics,” “quantum physics” and “quantum theory” refer to the same thing. Quantum mechanics encompasses all branches of physics known as “quantum.”
Quantum mechanics is the framework that all the laws of nature are formulated upon.
Quantum mechanics is an abstract framework in the same sense that classical/Newtonian mechanics is, you must specify the particles and forces/interactions, but once this is done, the quantum mechanical system makes predictions for any physical experiment.
The theory of relativity is given by the famous German physicist Albert Einstein. The actual problem was that the particle moving at low speeds do follow the laws of motion given by Sir Isaac Newton but as the particle starts approaching the speed of light it will no longer follow the Newtonian laws.
Special Theory of Relativity :-
Time is relative not absolute, All our day-to-day experiences tell us that time is absolute. Whatever else may change, time moves forward at the same constant rate. We experience that time is absolute or constant because our speed of movements is far lesser than the speed of light. To rephrase the above sentence, for a person moving at relativistic (close to the speed of light i.e, nearly 3*10^8 m/s) speeds, time moves differently than for someone who is at rest. This is called the special theory of relativity, which was said to be true in special cases i.e, absence of gravitational field.
- Creates theories about structure in the universe.
- It deals principally or theoretically with phenomena.
- Branch of astronomy.
- Stand on the basis of pure mathematics.
Atomic And Molecular Physics
Molecular physics is the physics of molecules – how they spin and how the individual atoms that make them up vibrate. The energy of these rotations and vibrations is small, about the same as the energy carried by a photon of a microwave or infra-red radiation.
Atomic physics is the physics of electrons in atoms – their spin and vibration. They move between energy levels in the atom emitting and absorbing electromagnetic energy as they do. The energy of these transitions is typically around the same as a photon of visible light (roundabout 50-100 times more energetic than far infra-red light).
Particle Physics is a branch of physics studying the smallest elements of matter using mainly accelerators in order to collide particles ( going from electrons to heavy ions) and then to observe, with the help of all kinds of detectors, results of these collisions, which enables to make conclusions concerning interactions of elementary particles, their different forms and structure. One should also mention theoretical particle physics which concentrates mainly on the theoretical description of this world of elementary matter components. Particle physics
Applied physics engenders a pragmatic approach, largely concerning itself with applying all of this knowledge, in combination with relevant knowledge from other fields, to potentially practicable scenarios for whatever reasons.
Why should students study physics?
Physics is everywhere and probably that’s why you need to study it. What good will it do if you don’t have any idea of how things around you work?
The discoveries fascinate people, and so they want to explore the Mystery behind that discovery and ultimately after a time they get familiar with the fact that this Mystery is nothing but Just a science.
People are mad for the Answers.
Physics is just a way that can make you feel smarter and wiser.
So, people study physics to get smarter and Aware about their existence.
Physics has changed the world in such a way that nobody could ever do this without using physics.
Some discoveries that made People fascinated about Physics :-
Newton’s Laws of Motion :-
The three laws of motion were first compiled by Isaac Newton in his Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy), first published in 1687.
A simple application to explain the Classical Nature of the Physical World.
Special and General Relativity :
What to say about this ?, Einstein was the Celebrity of Physics at that time. Most of People get inspired to study Physics after reading Einstein’s research work.
The Postulates of Relativity has changed the way of thinking.
The God Particle Experiment :
though this isn’t the technical name of this experiment but this name was so famous and was on hype just after the LHC experiments.
The Detection of Gravitational waves :-
A Great Prediction of Gravitational waves was first made by Einstein, and the great LIGO experiment has detected the gravitational waves.
Physics is directly proportional to the Progression rate of Humankind.
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