Harpreet_Physics

Moments are the statistical tools used to describe the characteristics of a distribution. moments are the arithmetic means of first, second, third and fourth.

the correction between these n pairs of rank is called the rank correlation in the characteristics A and B for that group of individuals.

When one task is to be assigned to one person in such a way that the total person hours are minimized, then this kind of problem is known as assignment problem.

The method of variation of parameters is the general method which we use to find out a particular solution of a differential equation by replacing the constants in the solution of the homogeneous differential equation by functions and evaluating these functions so that the original DE will be satisfied.

The term ‘regression analysis’ means some sort of functional relationship between two or more related variables. Regression is the estimation of unknown values of one variable from known values of another variable.

The ratio test is also known as D Alembert’s ratio test. It was first published by Jean le Rond d’ Alembert.

An exact differential equation is formed by differentiating its solution directly without any other process,Is called an exact differential equation if it satisfies the following condition-

The rule of L’Hospital’s was given by  Guillaume de l’Hôpital. The technique discussed in this method is used to evaluate indeterminate forms. suppose we have two functions f(x) and g(x) and both are zero at x = a, then the fraction f(a)/ g(a) is called the indeterminate form 0/0.

introduction to the method of least squares- When we find the area of a triangle then it depends on base and height, hence we can say that area of the triangle is the function of base and height.

When we find the area of a triangle then it depends on base and height, hence we can say that area of the triangle is the function of base and height. In other words, when we have a mathematical function having more than one variables, we use partial differentiation.

Comparison test, which is also known as limit comparison test. we use this method to test the convergence of an infinite series.

In the narrow sense of the term, the theory of function of a complex variable is the theory of analytic functions (cf. Analytic function) of one or several complex variables.

The entropy of a substance is a real quantity, just like pressure, volume and temperature. Its unit is joule/Kelvin (J/K).

A crystal is a solid whose constituent atoms, ions or molecules are closely packed in a regular fashion with repeating pattern in three dimensions.

Nanotechnology is dealing with the characterization, design, production and various applications of nanostructures and nanosystems.

Nanotechnology have considered as the solution to our smallest to biggest problems. Applications of Nanotechnology are countless.

Ampere’s circuital law is one of the general laws of magnetism. This law used to find the magnetic field due to current distribution.

Thermodynamics is the branch of physics which deals with heat and other forms of energy and also gives relationships between them.

Drude and Lorentz gave classical free electron theory of metals theory in 1900. Another name for this is Drude –Lorentz theory of metals.

In 1895, German physicist Wilhelm Roentgen discovered X-rays. X-rays are electromagnetic in nature and application of X-rays are innumerable.

Faraday’s law gives the idea about how an electromotive force comes into action when a magnetic field interacts with an electric circuit.

W. L. Bragg gave a simple explanation for the study of crystal structure by using the phenomenon of diffraction and name it is as Bragg’s law.

Bravais lattice gives information of the periodic array in which the repeated units of the crystal are arranged.

CRO or Cathode Ray Oscilloscope displays and measures the electrical signals, time intervals and phase shift between two electrical signals.

Helium-Neon Laser laser is a gas laser. In this a mixture of helium and neon gas is used as a gain medium. It was the first continuous-wave laser.

Shock waves are strong pressure waves in any elastic medium like water, solid or air. Supersonic aircraft or lightning produce Shock waves.

Simple Harmonic Motion (SHM) is when the restoring force is directly proportional to the displacement of the body from its mean position.

The number of atoms present in the excited state is greater than the number of atoms in the ground state is called population inversion.

Rate of Stimulated emission depends upon the number of atoms present in the excited state as well as the energy density of photons.

In 1960, Maiman constructed the Ruby laser. It is a three-level solid-state laser and is emitting red light of wavelength 694.3 nm.