Content Curator
Statistical Physics is the study of the macroscopic parameters of a system in equilibrium based on the knowledge gained from its microscopic properties using the laws of mechanics. It is a branch of physics that has developed from statistical mechanics. The aim of statistical physics is to use the understanding of microscopic laws governing the motion of atoms and another law of statistical physics to give the expression of free energy.
| Table of Content |
Keyterms: Macroscopic parameters, Atoms, Energy, Mechanics, Motion, Thermal equilibrium states, Non-equilibrium states, Thermodynamics
Read More: Subatomic Particles
What is Statistical Physics?
[Click Here for Sample Questions]
Statistical Physics is a branch of physics that has developed from statistical mechanics. The aim of statistical physics is to use the understanding of microscopic laws governing the motion of atoms and another law of statistical physics to give the expression of free energy. Statistical physics involves the study of both thermal equilibrium states and non-equilibrium states. This is unlike thermodynamics, which studies macroscopic systems in equilibrium from a macroscopic perspective without taking into consideration the microscopic parameters.
Statistical Physics deals with microscopic laws
Also Read:
| Related Articles | ||
|---|---|---|
| Helmholtz Free Energy | Value of Boltzmann Constant | |
| Difference Between Diffusion and Osmosis | Properties of Colloids | |
| Classification Of Colloids | Kinetic Theory | |
Need for a Statistical Description in Physics
[Click Here for Sample Questions]
Statistical Physics provides a link between the macroscopic and microscopic views. For example, in the study of gases, examining the statistical distribution of particle velocities gives an understanding of the relation between the macroscopically observable quantities such as volume, temperature and pressure. Listed below are some examples where the statistical description has been beneficial.
- Applying the statistical approach to thermodynamics can help gain a better understanding of entropy. For example, the temperature can be statistically understood as the average kinetic energy of atoms in a matter.
- In quantum physics, the application of statistics to describe processes such as Brownian motion has been useful for the derivation of the “path-integral” formulation.
Brownian Motion
- Maxwell-Boltzmann statistics are used to understand the distribution of particles at various energy levels as a function of temperature. This helps to get an insight into the processes, such as diffusion.
The study of statistics in all scientific disciplines provides a practical set of tools to test hypotheses and to estimate confidence intervals on aggregate data. It forms the basis of the design of experiments, interpretation of data and correlation of information, which lies at the core of the development of modern science.
Read More: Cathode Ray Discharge tube
Application of Statistical Physics
[Click Here for Sample Questions]
- Maxwell’s distribution of molecular velocity is based on statistical physics.
- With the help of statistical physics, Gibbs explained thermodynamics.
Things To Remember
- Statistical physics is a branch of physics that grew from statistical mechanics.
- It gives us the expression of free energy by using microscopic laws of a system along with another law of statistical physics.
- By using the knowledge of the microscopic properties, statistical physics gives a better understanding of the macroscopic parameters of a system in equilibrium.
- It forms a link between the macroscopic and microscopic parameters of a system.
- Statistical physics forms the basis for designing scientific experiments, data interpretation and correlating information.
Also Read:
Sample Questions
Ques: Explain statistical physics. (2 marks)
Ans: Statistical physics is a branch of science derived from statistical mechanics. It uses the laws of mechanics with the understanding of the microscopic properties to study the macroscopic parameters of a system in equilibrium. So, it uses the fact that matter comprises atoms. By using the microscopic laws along with another law of statistical physics, it gives an expression of free energy. Statistical physics involves the study of both thermal equilibrium states and non-equilibrium states.
Ques: State some applications of statistical physics. (2 marks)
Ans: Some applications of statistical physics are:
- Gibbs gave an explanation for thermodynamics with the help of statistical physics.
- For Maxwell’s distribution of molecular velocity, the application of statistical physics was to understand the distribution of molecules in an assembly.
Ques: Which law gives the distribution of particles at different energy levels as a function of temperature? (2 marks)
(A) Faraday’s law
(B) Gibbs’ law
(C) Plank’s law
(D) Maxwell-Boltzmann statistics
Ans: D. Maxwell-Boltzmann statistics
Maxwell-Boltzmann statistics are used to explain the distribution of particles at different energy levels as a function of temperature. It also helps to get an insight into the processes such as diffusion.
Ques: State whether this statement is true or false. Why? (2 marks)
Statement: Statistical physics provides a link between macroscopic and microscopic views of a system.
Ans: The given statement is true. Statistical physics aims to understand the macroscopic parameters of a system in equilibrium by using the knowledge of their microscopic properties. It uses the fact that matter consists of atoms. And thus, forming a link between macroscopic and microscopic parameters.
Ques: How can statistical physics be used to study gases? (2 marks)
Ans: In the study of gases, statistical physics can be useful to examine the statistical distribution of particle velocities. And also to understand their relationship with macroscopic quantities such as pressure, temperature and volume.
Ques: Which of the following branches of physics evolved from statistical mechanics? (2 marks)
(A) Quantum Mechanics
(B) Statistical Physics
(C) Mechanical Physics
(D) Modern Physics
Ans: B. Statistical Physics
Statistical physics is a branch of physics that originated from statistical mechanics, which uses statistics, probability theory and mathematical tools to deal with large approximations to solve physical problems.
Ques: Statistical physics uses the laws of mechanics to study the (2 marks)
(A) macroscopic parameters
(B) microscopic parameters
(C) constant parameters
(D) None of the above
Ans: A. macroscopic parameters
Statistical physics uses the laws of mechanics to study macroscopic parameters. It uses the knowledge of microscopic properties to get a better understanding of these macroscopic parameters. To do so, it utilizes the fact that matter is composed of atoms.
Ques: As per statistical physics, matter consists of (2 marks)
(A) air
(B) atoms
(C) water
(D) none of the above
Ans: B. atoms
Statistical physics uses the fact that matter consists of atoms. Through the law of mechanics, it uses the microscopic properties of a system to understand its macroscopic parameters. It creates a link between the macroscopic and microscopic properties of the system.
Ques. What are Free electrons? (2 marks)
Ans. Free Electrons In metals, the electrons in the outer shells (valence electrons) are loosely bound to the atoms, hence they are free to move easily within the metal surface but cannot leave the metal surface. Such electrons are called free electrons.
Ques. What are the laws of Photoelectric Emission? (3 marks)
Ans.
- For a given material and a given frequency of incident radiation, the photoelectric current number of photoelectrons ejected per second is directly proportional to the intensity of the incident light.
- For a given material and frequency of incident radiation, saturation current is found to be proportional to the intensity of incident radiation, whereas the stopping potential is independent of its intensity.
- For a given material, there exists a certain minimum frequency of the incident radiation below which no emissions of photoelectrons take place. This frequency is called threshold frequency.
For Latest Updates on Upcoming Board Exams, Click Here: https://t.me/class_10_12_board_updates
Check-Out:
Comments