Modern physics.

 Photon theory of light (Quantum theory)

(1)  Light is made up of particals called photons.These are massless and chargeless particles which travel with speed of light (C=3×10*8m/s in vaccume with respect to any frame of reference.

(2)  Rest mass of photons is zero.

Each photon carry definite energy and momentum which is associated with wavelength of light as

(3)  Energy of photon(P)=HC/¥ or =hv

                       h=plank's constant (6.6×10*-34 J.s)

                        ¥= wavelength(lamda)

                         v=frequency

(4)  These may be an interaction between two photon and matter particles.Total energy and momentum are always conserved during the collision 💥 but number of photons may not be conserved during the interaction.

(5)  Intensity of light 🕯️ depends on number of photons 🤞 per unit area per second ande energy (hv) of each photon.

                    I=nhv/A

          n=number of photons crossing area per second

          hv=energy of each photon.

Some Important values:

v=1/¥

E=hC/¥(in nm) ev  =12420 ev/¥

1ev(electron volt) =1.6×10^-19Joule.

☢️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️☢️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️☢️

Fundamental quantities in physics.

 Their are seven fundamental quantities in physics 

1) Length:  m(meter) is si unit of length. 

           It is defined as fix numerous value 299792458 m/s(in vacuum),whear s is defined as frequency of caesium 

2) Mass: kg(kilogram)is si unit of mass.

            It is defined as by taking a fix numourouse value of plank's constant 6.62607015× 10^-34 j.s (joule.second)

Here,we can see that mass is expressed in form of energy in term of joule , it is due to E= MC^2.

3) Time:(s) second is si unit of time.

            It is defined as by taking a fix numourouse value of caesium frequency (caesium -133atom) hyperfine of transmission frequency of caesium to be 9192631770 when expressed in form of Hertz.

4)Temperature (thermodynamics): k(Kelvin) is si unit of temperature.

             It is defined as by taking a fix numourouse value of boltzmann constant 1.380649×10^-23.whezr expressed in unit of j/k

5)Electric (charge):A(ampere) is si unit of electric current (charge).

              It is defined as by taking fixed numourouse value of e ( elementary charge) 1.602176634×10^-19C(Ampere/second).

6) Amount of substance: mol(mole) is si unit of Amount of substance.

             It is defined as fix numourouse value of partical that's 6.02214076×10^23. partical can be of any substances.

7)Luminous Intensity:cd(candela)is si unit of luminous intensity in a given direction.

            It is defined as fix numourouse value of monochromatic radiation of frequency 540×10^12Hz.

There are two additional unit which is used in physics by using mathematics term that is RADIAN(for plane angle) and STRDIAN (for solid 3-D angle).

Some value which can be used for solving numerical that's

🌟Speed of light (vaccume): 3×10^8m/s

🌟Plank's constant:6.67×10^-34j.s

🌟electric charge in electron:1.6×10^-19c

🌟Mole:6.022×10^23.

Rest of quantities are derived by help of these quantities.

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Keep doing.

Importance of physics in human life.

Think to grow up 

  It has a important role in our daily lives in many ways, some of which are as following way

1. (1) Medicine: Physics is also critical in the field of medicine. Medical devices such as MRI machines, X-ray machines, and ultrasounds all use principles of physics to function.
   (2) Energy: Physics is essential in the production and distribution of energy. Energy sources such as nuclear power, wind turbines, and solar panels all rely on physics principles to generate energy.

2. (3) Technology: Physics is the foundation of modern technology. Many inventions and advancements that we use in our daily lives, such as smartphones, computers, and transportation systems, are based on the principles of physics.

3. (4) Environmental science: Physics is essential in understanding the causes and effects of climate change, as well as the development of technologies to mitigate its impact are so wide .

   (5) Medical technology: Physics has contributed to the development of many medical technologies, such as X-rays, magnetic resonance imaging (MRI), and positron emission tomography (PET) scans,in it doctor give a radioactive ☢️ liquid to drink (don't warry it has very less amount of dps which does not cause any issues to related to our health).
   (6) Energy production: Physics plays a crucial role in the production and use of energy, from the development of renewable energy sources such as wind and solar power to the creation of nuclear power plants.
   (7) Space exploration: Physics is essential in space exploration. Understanding physics principles helps scientists and engineers design spacecraft, rockets, and satellites that can withstand the harsh conditions of space.Nowadaya space has boom specially in India.

   (8) Technology: Physics has led to the development of technology that has revolutionized our daily lives. For example, physics principles are applied in the development of smartphones, computers, medical equipment, transportation systems, and many other devices that we use daily.

Overall, physics is a crucial discipline that underpins much of modern technology and helps us understand the world around us. Its impact on human life cannot be overstated.

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Defination of physics

What is physics 

 (1).   Physics is branch of science which tell as about pattern of nature 's law.

(2).     Physics is the branch of science that deals with the study of matter, energy, and their interactions.

(3). It explain the fundamental principles that govern the behavior of the physical universe

(4). Mathematics is language of physics,at higher physics's concept without mathematics we can't understand core concepts of physics.

Hence,we can say that physics without mathematics is not sufficient to know more about nature's law (mathematics is Queen of physics)

The rising of mathematics is for helping to proof our physic in a logical to proper way, that's why physics can be easily understandable. !!!!