Applications of Kirchhoff’s Law According to Kirchhoff’s law the ratio of emissive power to absorptive power is same for all surfaces at the same temperature and is equal to the emissive power of a perfectly black body at that temperature. Applications: 1) Sand is rough black, so it is a good absorber and hence in Read more about Applications of Kirchhoff’s Law[…]
Resistance Resistance is the opposition to the passage of current within a component. The resistance of a component decides how much voltage will be dropped across it for a particular current. 1) The property of substance by virtue of which it opposes the flow of current through it, is known as the resistance. 2) Formula Read more about Resistance[…]
Phase Change 1) Phase: We use the term phase to describe a specific state of matter, such as solid, liquid or gas. A transition from on phase to another is called a phase change. i) For any given pressure a phase change takes place at a definite temperature, usually accompanied by absorption or emission of Read more about Phase Change[…]
Perfectly Black Body A body which absorbs the entire radiant heat incident upon it is called a perfectly black body. Thus, the coefficient of absorption of a perfectly black body is equal to 1. 1) A perfectly black body is that which absorbs completely the radiations of all wavelength incidents on it. 2) As a Read more about Perfectly Black Body[…]
Resolution of vector into components The process of splitting a vector into various components is called as Resolution of Vector. These parts of a vector may act in different directions and called as components of vector. We can resolve a vector into a number of components. Generally there are three components of vectors. Component along Read more about Resolution of vector into components[…]
Gravitational Potential At a point on a gravitational field potential V is defined as negative of work done per unit mass in shifting a test mass from some reference point to the given point i.e., i.e, i.e. negative gradient of potential gives intensity of field or potential is a scalar function of Read more about Gravitational Potential[…]
Cyclotron Cyclotron is a device used to accelerate positively charged particles like, particles, deuterons etc. to acquire enough energy to carry out nuclear disintegration etc. It is based on the fact that the electric field accelerates a charged particle and the magnetic field keeps it revolving in circular orbits of constant frequency. It consists of Read more about Cyclotron[…]
Linear Momentum The linear momentum of a particle of mass m moving with a velocity v is defined to be the product of the mass and velocity. It is a vector quantity. It is mathematically. , 1) Linear momentum of a body is the quantity of motion contained in the body. 2) It is measured Read more about Linear Momentum[…]
Types of Waves Waves can occur whenever a system is disturbed from equilibrium and when the disturbance can travel or propagate from one region of the system to another. Waves can be classified in a number of ways based on the following characteristics 1) On the basis necessity of medium: i) Mechanical waves: Require medium Read more about Types of Waves[…]
Specific Heat of Liquid Specific heat is the amount of heat in calories required to raise the temperature of 1 gram of a substance by 1 degree Celsius. The value depends on the liquid; water has a specific heat of 1 Cal/gram/degree Celsius. Ethyl alcohol has a specific heat of 0.58 Cal /degree Celsius. Mercury Read more about Specific Heat of Liquid[…]