Revision Notes for Class 12 Physics Chapter 12 Atoms Thomson’s model of atom: It was proposed by J. J. Thomson in 1898. According to this model, the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons are embedded in it like seeds in a watermelon. … Read more
Here we are providing revision notes for class 12 physics chapter 7 alternating current. Students can use this article for quick revision of the chapter. Revision Notes for Class 12 Physics Chapter 7 Alternating Current 1. Alternating current. It is that current which varies in magnitude continuously and reverses its direction periodically. Its value at … Read more
Wavefront : The locus of all particles of the medium vibrating in the same phase at a given instant is known as wavefront.Depending on the shape of sources of light, wavefront can be of three types>> Spherical wavefront : When the source of light is a point source, the wavefront is spherical.>> Cylindrical wavefront : … Read more
Electron emission: The phenomenon of emission of electrons from the surface of a metal. The minimum energy needed by an electron to come out from a metal surface is known as “work function” of the metal. It is denoted by Φ0 or W0 and measured in electron volt (eV). Work function W= hυ = hc/λ … Read more
