User:Aniruddhha Chowdhury

About me
Though as a user,you are seeing me as Aniruddhha Chowdhury;it's not my real name! Only the user name,you can say! My real name is Satwik Chowdhury. I live in West Bengal,India. To tell something about me,firstly I shall say that I am someone who is very interested in Physics,theoretical and experimental both! Currently I am a graduate student of Physics under University of Calcutta. (My father is a service-man. He is assistant-registrar of Calcutta High Court. My mother is a house-wife. We live in a government-flat in Howrah,near calcutta) As I have written several times in Wikipedia on Physics,you may say me a wikipedian! I always try to write something new instead of those things already known by most of the physics students,professors etc. or written in most of the text-books. I want to share my ideas with you those I think throughout the day,even sometimes when I am taking my lunch or dinner or in bathroom!(Though it's not that I am always in a mood to think or doing experiments with Physics, yet everyday I try to think something new!)You,as readers,will always help me about my writings,commenting on it by sending me e-mail or by phone(my cell-phone number is 918902693831). I am a great fan of eminent physicist and philosopher Sir Albert Einstein and our pride world-poet, philosopher Nobel-laureate Rabindranath Tagore, world famous film-director and writer Satyajit Ray and his son famous film-director Sandip Ray.

Physics & modern technology
Science is not a closed book,never will be-as said by Albert Einstein in his "Evolution of Physics". If we begin to think observing the present days' technological progress, that perhaps all the things in Physics have already been discovered,it will be a great mistake! What you see in your cell-phone or computer is the play of electrons! Millions of digital switches,amplifiers etc. are controlling your apparatus. But it's not the whole story! What is really the electron? Do we know exactly what it is? But the operation of your machine doesn't depend on this,let it be like a billiard ball,let it be a wave,let it be a string,what you wish! Also it doesn't depend on the nature and structure of nucleus of atom and strong interaction in it,or curvature of space-time due to gravitational-field,or if fundamental interactions are unifiable or if a successful quantum-gravity theory is constructable etc. etc.! When Lilienfeld or Shockley,Bardeen,Brattain invented transistor,they need not know much about Dirac's theory or Schrodinger's theory! If you want to know about the operation of an ordinary semiconductor junction-diode or transistor,it is enough only to have some knowledge about Bohr's theory, Fermi-dirac distribution,something about ideal gas ,its kinetic theory and some easy electrical laws. No modern quantum mechanics!(The concept of quantized energy levels or bands can well be described using Bohr's theory!)You may ask that isn't the Fermi-Dirac distribution a part of modern Q.M.? I shall say that though it is applicable to fermions(like electron),and the concept of fermion is related to modern Q.M.,yet if you take electron something that obeys Pauli's exclusion principle( formulated by Wolfgang Pauli in 1925 before the advent of modern Q.M.), then you can prove the distribution without the help of modern Q.M.(theorized first by Heisenberg,then Schrodinger)i.e. wave function,uncertainty etc.. While calculating the density of electrons in conduction or valence band, we need to know the density of states in the corresponding band, in which a factor "2" comes due to the spin of electrons, but it's not so important(the idea of spin also came before modern Q.M. by Pauli,Uhlenbeck,Goudsmit,Kronig; rather explained satisfactorily by relativistic wave equation of Dirac; yet why this "2" comes, you can just guess from old spin-concept ). To describe capacitors,resistors,inductors classical electromagnetism is enough! If you want to design a circuit using some transistors, diodes, capacitors etc., then knowing even all these aren't necessary at all!( For example, if you use Shockley's equation to calculate diode current for a given p.d. across it, you needn't know the details how this equation comes, if survival equation is used to get this, again how does it come etc.!!! They will just interrupt your main purpose!) But VLSI or ULSI chips in modern appliances are fabricated by nothing but millions of these diodes,transistors,resistors,capacitors etc. The display-units like CRT,LCD etc. also don't require much complicated theories or modern theories to be described! (The operation of tunnel or Esaki diode needs some modern Q.M. to be explained;but it is not largely used semiconductor device)So only knowing classical physics and a little quantum physics you can explain most of the ultramodern circuits entirely! But is it all of the Physics?!!!!

Theoretical Physics
The founding father of modern theoretical physics is undoubtedly Galileo. This great man of 16th century was expert enough to understand Newton's 1st and 2nd law. By inclined plane experiment, he discovered the laws of freely falling object due to gravity.He was the first person to prove and say that projectiles thrown at some angle with horizontal or at the horizontal direction from some height,always follows a parabolic path. Most of us know his other discoveries like telescope, moons of Jupiter, phases of Venus, simple pendulum's period of oscillation depends only its length etc. Perhaps his most ingenious guess was that light has a finite speed, that was not mostly believed at his time including Descartes; though he couldn't measure it. Later Roemer, Fizau and others measured it. But until Einstein's theory of special relativity came into physics, it did not have such a crucial role in Physics that is it the maximum speed limit,not only uncrossable, but also unreachable excepting light or other electromagnetic waves(sometimes also neutrino!).