# physics
# -------

## Constants in which all the constants are expressed
- Speed of light in vacuum: 299792458 m/sec
- Planck constant: 6.626x10^-34 J.sec
- Elementary charge: 1.602x10^19 C
- Avagadro constant: 6.022x10^23 
- Boltzmann constant: 1.38x10^-23 J/K

Falling  ----+   Netonian
apple        |-> gravity -------+
orbits of ---+                  |
planets                         |-> General --------> Cosmology
                                |   relativity
Space -+         Special    ----+
       |-------> relativity ----+
Time --+                        |
                                |-> Quantum -------++
                                |   field theory   ||
Quantum -------> Quantum -------+                  ||
theory           mechanics                         |-> Quantum
                                                   ||  electrodynamics
                                                   ||  |
Electricity -+                                     ||  v
             |-> Electromagnetism -----------------+|  Electroweak
Magnetism ---+                                      |  theory  |
                                                    |  ^       v
                                                    |  |      The standard model
Atoms ---------> Nuclear forces-+-> Weak nuclear ---|--+      of particle physics
                                |   force           |          ^
                                +-> Strong nuclear -+> Quantum +
                                    force              chromodynamics

Heat and
energy ------+
             |-> Thermodynamics
Statistical -+
mechanics

## Thermodynamics
- 0th law: If two systems are in thermodynamic equilibrium with a third system, the two original systems are in thermal equilibrium with each other.
- 1st law: energy can be converted from one form to another but it cannot be created nor destroyed.
- 2nd law: entropy of a closed system always increases.
- 3rd law: crystalline structure, at absolute zero (0 Kelvin), will have no entropy (S).

## Quantum Entanglement
### john bell experiment
- allows to verify between Bohr's and Einstein's argument on Quantum 
  entanglement
### philip ball's analogy of John bell's experiment
- #->BoxA->R
- $->(BoxA && BoxB)->(R,D || D,R)
- in remaining cases -> (2R || 2D)
- p_B(R/£1)=0.75 (count{A1B1,A1B2,A2R}/count{A1B1,A1B2,A2R,A2D})

hadrons:

## CPT symmetry

## Einstein's Field equation
Gμν + Λgμν = (8πG/c⁴)Tμν
LaTex: G_{\mu\nu} + \Lambda g_{\mu\nu} = ({8\pi G}/{c^4}) T_{\mu\nu}

Geo stationary orbit 35000km 10th of the orbit of moon

Low earth orbit 350km

- chandrasekhar limit: 1.44 solar mass
- speed of light c = 299792458m/s

- Quantum Gauge theory in 4 dimensional space
  - The Yang-Mills existence and mass gap problem

## Nobel prizes
- Shuji Nakamura: 2014, efficient blue light emitting diodes
  - ZincSelenide(ZnSe) 0.3% lattice mismatch with its substrate: GaAs: 
    <1000 defects/cm2, able to create n-type but not p-type
  - GalliumNitride(GaN) 16% lattice mismatch with its substrate: Sapphire
    >10billion/cm2, only n-type, >1milliwatt, 30microwatt blue led made by
    herbertMaruska in 1972
    - GaN|AlN|Saphire gives clean GaN crystal but Al spoils MOCD reactor
    
## Rocket science
- Earth escape velocity: 11.1km/s
- least earth orbit velocity: 7.8km/s
- low-earth orbit < 2000km
- medium-earth orbit 2000 - 35786 km
- high-earth orbit 42164km
- 1st indian satellite on indian rocket SLV3 is rohini, july 18th, 1980.
- Chandhrayan 1, PSLV.
- Mangalyan 1st attempt. Ritu Karidal.
- 23rd Aug, 2023. Chandhrayan 3 
- దృశ్యము వదిలి దృక్కు (observer) స్వరూపమైన మీ ఆత్మను పొందండి. దృక్కు కంటే దృశ్యము వేరుగా లేదు
  దృక్కే దృశ్యం గా ఉంది 
  :::: ఆదిశంకరాచార్యులు