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Scope and Excitement of Physics: the basic NCERT concept

Physics covers a large area of study. Its range is very vast, from molecular level to astronomical level. Thus it's exciting also. So, in this article we will be discussing about scope and excitement of Physics. What does the word scope actually mean, sub-disciplines of Physics, how Physics excites, etc. are the main highlights of the article.

This article is in the continuation to my previous article What is Physics: the basic NCERT concept So this is the second article of NEPYK Series (A series deeply explaining the concepts of NCERT Physics). In this article we will talk about the scope and excitement of Physics. So let's begin.

A)Meaning of 'Scope':-

What does the word 'scope' actually mean? Basically when we talk about the scope of any subject, we talk about the expanse of the particular subject. Talking about the scope of Physics is very interesting. We can understand the scope of Physics by discussing its various sub-disciplines.

But before diving into its sub-disciplinarian parts, we need to know what macroscopic, mesoscopic and microscopic phenomena are?

B) Microscopic, Mesoscopic and Macroscopic Phenomena :-

Macroscopic Phenomena, Mesoscopic Phenomena and Microscopic Phenomena are 3 domains of interest in Physics.
Macroscopic Phenomena are the phenomena which take place at laboratory, terrestrial or astronomical level.
-> Terrestrial means 'on or related to the earth'.(earthly)

Microscopic Phenomena are the phenomena which take place at molecular or atomic level.

Range of Mesoscopic phenomena is in between that of microscopic and macroscopic phenomena. This level of Physics is applicable when we insist on miniature of the macroscopic level phenomena as done in Electronic Physics where we're trying to miniaturise the transistors and some other electronic devices. It deals with some tens or hundreds of atoms in its systems.

C)Sub-disciplines of Physics :-

Classical Physics :-

The sub-discipline of Physics that deals with macroscopic (in general) phenomena is said to be Classical Physics. Theories of Classical Physics are generally not valid for microscopic and mesoscopic phenomena. Mechanics, Electrodynamics, Optics and Thermodynamics etc. are the sub-parts of the Classical Physics.
Let's dive deep into it -


The area of Physics that deals with the behaviour of bodies and their effect on the environment when subjected to external mechanical force can be referred to as Mechanics.

Now, What is mechanical force?

This is the type of force which requires contact between the bodies. Pushing a door or pulling a rope is an example of mechanical force.

Mechanics founded on Newton's laws of motion and gravitation. It includes motion of particles, study of deformable and rigid bodies, general system of particles etc. The propulsion of a rocket by jet of ejecting gases, propagation of different types of mechanical waves such as sound or water waves, equilibrium of a bent rod under a load etc. are the problems of mechanics.

(ii) Electrodynamics:-

The area of Physics that deals with the electric and magnetic phenomena associated with charged and magnetic bodies can be named as Electrodynamics. Its basic laws were given by Coulomb, Oerested, Faraday and Ampere. The laws were integrated by Maxwell through his famous set of equations.

Motion of a current carrying wire when placed in magnetic field, response of electrical circuits to ac voltage(signal), working of antenna, propagation of radio waves in ionosphere are the interesting problems in Electrodynamics.

(iii) Optics :-

The branch of Physics that deals with light related phenomena is referred to as Optics. It covers the problems related to optical phenomena and instruments.

(iv) Thermodynamics:-

Thermodynamics is the branch of Physics that deals with the situations consisted of macroscopic equilibrium and is concerned with entropy change, temperature, internal energy etc. of the system through external work and heat transfer. It is different from Mechanics as it doesn't deals with the motion of particles as a whole. Efficiency of engines and refrigerators, direction of physical or chemical processes are the problems of interest in Thermodynamics.
It was the brief introduction of Classical Physics that generally deals with macroscopic phenomena.

Quantum Physics :-

Classical Physics is not valid for microscopic phenomena that take place at atomic or molecular level or even smaller ranges. So, to explain these types of phenomena Quantum Physics is accepted as a proper framework.
For now, we can take a example of the following line-
- - - - - - - - - -

When you will see the line from a big distance, you will find it almost continuous. But close observation says that these are not continuous and it's the major difference between macroscopic and microscopic phenomena.

So, we see that Physics has a vast scope overall.

Excitement of Physics:-

Physics is a very exciting subject. It excites differently as per one's mentality about Physics. Some think that they can pose huge magnitude of physical quantities with help of a few basic principles. For some each and every problem in the Physics is a challenge. How to tackle with the different types of natural phenomena in terms of Applied Mathematics is the basic key of progress of Physics.

Excitement Leads to Progress:-

What is the reason for so rapid progress in Physics during the past few decades? It's basically its excitement: excitement to experiment, excitement to find new ways of learning,etc. Consequently change in the followable methods has played the major role in this progress.

Major Insights:-

First, it was considered that only qualitative approach is not enough, quantitative approach is in the center of Science especially in Physics where laws are expressed in the terms of suitable mathematical equations. Secondly, laws of Science founded to be universal, Finally strategy of approximation turned out to be the most successful one. Almost all phenomena in our daily life are the complex application of basic universal physical laws. Later on we also knew the value of less significant factors in general application of basic laws. For instance, when stone and a light feather are allowed to fall freely to the ground, in open air environment, we know that stone would reach first due to the less significant factor: air resistance. But if we let it fall freely in an evacuated tube,where air resistance is negligible, both will fall in same time according to essential factor: free fall under gravity.

Thus Physics is a very vast, interesting and exciting subject. Proving its laws is a thrilling work for lover of Physics. As we will go on, we will see many interesting parts of Physics. And possibly, you will also love Physics.

Hope you found the article useful, if you have any queries regarding the above article, please mention it below, I will try to solve that in the best way possible.


Author: Lovish Raheja25 Jul 2017 Member Level: Silver   Points : 0

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