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By Bhupesh sahu - April 08, 2020

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Photoelectric effect

By Bhupesh sahu - April 08, 2020

Photoelectric effect: when light is incident on a metal surface then electrons are emitted from it. This phenomena is called photoelectric effect.The emitted electrons are called photoelectrons. Laws of photoelectric emissions : 1. The emission of photo-electrons takes place only when the frequency of incident radiation is above certain critical value of that metal.This critical value is called threshold frequency . 2 . The emission of photo-electrons starts as soon as the light falls on metal surface i.e.the photoelectric emission is instantaneous. 3 . The maximum kinetic energy with which the photo-electrons are emitted from a metal surface is independent of the intensity of the light and only depends upon the frequency. 4 . For a given frequency, the number of photo-electrons emitted is directly proportional to the intensity of incident light . 5 .The energy distribution of the photo-electron is independent of the intensity of the incident ...

DE-BROGLIE WAVELENGTH

By Bhupesh sahu - May 10, 2020

I) In term of energy:- Kinetic energy of a potential of mass m moving with velocity v is given by Where p is momentum of particles Therefore, We knowing that de- Broglie wavelength λ= h/p Therefore, ........................(1) II) In term of temperature:- From kinetic energy of gases, the average kinetic energy of a material particles at temperature T is given by Where k is Boltzmann constant. The value of k= 1.38 x 10^-23 J/k Putting this value in eq (1), we get Therefore, ...................(2)

Classification of solids

By Bhupesh sahu - August 29, 2020

Solids:- Sol ids : The solids are the forms of matter in which atoms ands molecules are strongly bound and maintain definite volume and sharp unless changes by applying external forces. Solid state physics: - The solid state physics is the study of the physical properties of the atomic/molecular matter in the solids state. These physical properties include crystal structure, bonding,thermal, electric and magnetic properties. Classification of solids: Solids are classified into two categories; (1) crystalline solids (2) Amorphous solids. (1) crystalline solid :- The crystalline solids are defined as an ordered periodic arrangements of atoms, molecules or ions . Properties of crystalline solids:- • The internal arrangements of atoms,ions or molecules of crystalline solids is in a definite order. • The crystalline solids have ...