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Cube Resistance Problem | JEE Main | JEE Advanced Cube Resistance Problem | JEE Main | JEE Advanced :- For a cube having equal resistance along its edges, let’s determine the equivalent resistance between :- Two vertices along the body diagonal Two vertices along the face diagonal Two adjacent vertices Equivalent resistance…
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Davisson and Germer Experiment The Davisson and Germer experiment was a 1923-27 experiment performed by Clinton Davisson and Lester Germer to establish the wave nature of slow moving electrons. This confirmed the de-Broglie hypothesis of wave-particle duality. Experimental setup of Davisson and Germer Experiment The Davisson and Germer experiment is contained in a vacuum chamber…
Radiation Pressure Radiation Pressure :- Maxwell predicted that an electromagnetic wave carries momentum() and energy() and when this electromagnetic wave is absorbed/reflected by a surface, it would experience a force in a direction perpendicular to the surface. Maxwell’s prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures using…
State Heisenberg Uncertainty Principle State Heisenberg Uncertainty Principle :- According to Heisenberg it is impossible to measure the position and momentum of a particle simultaneously with 100% accuracy. This is called Heisenberg Uncertainty Principle. If Δx and Δp are the uncertainties in determining the position and momentum of the particle simultaneously, then …
de Broglie wavelength associated with an electron de Broglie wavelength associated with an electron :- Let an electron is accelerated from rest through a potential difference of V volt, then Kinetic energy acquired by the electron, Work done on electron, If the de Broglie wavelength of the electron is λ , then… de…
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de Broglie Equation de Broglie Equation :- Because radiation has a dual nature, that is, radiation exhibits both wave and particle properties, and because the universe is made up of radiation and matter, de-Broglie concluded that a moving particle must also have a dual nature because nature seeks symmetry. De Broglie’s hypothesis(de Broglie Equation)…
Commercial Unit of Electrical Energy | (BOTU) Commercial Unit of Electrical Energy :- The cost of electricity consumed in the factories, houses and for many other works is calculated on the basis of a unit called kilowatt hour(kWh). What is Commercial Unit of Electrical Energy | (BOTU) | kWh Commercial Unit of Electrical Energy…
Temperature Dependence of Resistivity Temperature Dependence of Resistivity :- The resistivity of almost all materials depends on temperature, but not all materials show the same temperature dependence. In a limited temperature range (about 100 ºC or less), the resistivity of a conductor is expressed by the following relation :- …..(1) Here ρt…
Carbon Resistor (Carbon Resistor Colour Code) Resistors used in laboratories and for domestic use are of two major types :- Wire bound resistors and Carbon resistors. 1. Wire bound resistors :- The selection of materials of wire bound resistors is done in such a way that their resistivity is relatively insensitive to temperature i.e., there…
Define Resistivity | Resistivity | Unit of Resistivity Resistivity | Define Resistivity :- In the previous article “Resistance” we saw that the resistance of a conductor is given by the following formula : …..(1) Here we say that ρ is a proportionality constant. In physics, to define a proportionality constant we use…
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