The Photoelectric effect, also known as the Hertz-Einstein effect, refers to the emission of free electrons from a metal surface when exposed to light with sufficient energy (frequency). This phenomenon was first observed by Hertz in the late 1800s and its true nature was later explained by Albert Einstein in 1905. Einstein’s theory showed that light consists of individual packets of energy, known as photons, each with a well-defined energy determined by its frequency. When a photon with energy greater than the work function of the metal (the minimum energy needed to remove a free electron from the metal) strikes the metal, a free electron is emitted. Continue reading Photoelectric Effect→
The de Broglie wavelength is a concept in quantum mechanics that relates the wavelength of a particle to its momentum. It was first proposed by Louis de Broglie in 1924 and has since become a fundamental aspect of our understanding of the subatomic world. Continue reading de Broglie Wavelength→
Self-inductance is a property of an electrical conductor that induces a voltage in the conductor itself as a result of a change in the current flowing through it. This property is a form of electromagnetic induction, which states that a change in magnetic field within a conductor will induce an electromotive force (EMF) in the conductor. The unit of self-inductance is the henry (H), which is equivalent to the voltage generated in a conductor when the current flowing through it changes at a rate of 1 ampere per second. Continue reading Self-Inductance→
Drift velocity is a key concept in the study of electrical current and is defined as the average velocity at which free electrons move through a conductor under the influence of an electric field. When an electric field is applied to a conductor, it creates a force on the free electrons, which results in their movement and the flow of current. The drift velocity is the measure of this movement of free electrons, and it is crucial in determining the overall electrical conductivity of a material. Continue reading Drift Velocity in Current Carrying Conductor→
The principle of conservation of angular momentum states that the total angular momentum of a closed system remains constant, if no external torque acts upon it. In other words, if an object is rotating, it will continue rotating at the same speed and in the same direction unless acted upon by an external force. Continue reading Conservation of Angular Momentum→
A diode is a two-terminal electronic component that conducts current primarily in one direction. It is made up of a semiconductor material, typically silicon, with impurities added to create a p-n junction. Continue reading Diode→
Physics, Math etc. by IIT Alumnus Online and Bhopal
