Notes for class 11th physic chapter 1

              1-physical World     

Physic :- lt is the branch of science which study about the nature and natural phenomenon

                    Scope of physics

Basically there are two domain of interest macroscopic and microscopic another one misoscopic. 

1-Misoscopic  :- In this domain range we will study the no of electron proton neuclus and the size of atoms   

2-Macroscopic:- In this domain ranges we will study the object at the laboratory terrestrial and astronomical scale 

3-Microscopic :- In this domain we will study the size of atoms neclus etc.

           Fundamentals forces in nature

1-Gravitational force:- it is the mutual attraction force between two bodies due to their masses and is called gravitational force

2-Electromagnatic force :- it is the attraction and repulsion force between two electric
 charges is known as electromagnetic force

3- Strong nucleus force :- it is the force in which holding protons and neutrons inside the nucleus is called the strong nuclear force -example -atom bomb

4-weak nuclear force:-it is the force in which work between elementary particles inside the nuclear process example radioactive decay

   Scientific method to study the nature

 1-observation
2-control experiment
3- reasoning analysis
4- mathematical modelling
5-prediction
6- varification /justification
   

      Thrust area and study of Physics

Unification :- it is the method in which different theories and laws can be explained by one minimum law - example Apple fall down  rain falling Earth revolves around the Sun all application can be expalaned  by the gravitational force

 

Reduction :- it is the method in which large and complex theory can be reduced in simple path

    

    Some physicists from different countries

Name.                 Discovery                  country 

1-Galileo Galileo     - Law of Inertia.     Italy 

2-Albert Enstein      examination of photoelectric theory of relativity       Germany  

3- Yukawa         forces            Japan 

4 - Edwin Hubble - Expanding universe      USA 

5- C.V Raman   Inelastic scattering of light by motorcycles      India