Science > Physics > Stationary Waves > Introduction to Stationary Waves Waves are classified as progressive waves and stationary waves. In this article, we shall study the meaning of stationary waves, their formation, and their characteristics. Mechanical waves: The waves which require an elastic medium for their propagation is called mechanical waves e.g. sound waves. […]
Science > Physics > Radiation > Numerical Problems on Newton’s Law of Cooling In this article, we are going to study to solve numerical problems based on Newton’s law of cooling. Newton’s Law of Cooling: The rate of loss of heat by a body is directly proportional to its excess temperature over that of the […]
Science > Physics > Radiation > Stefan’s Law of Radiation In this article, we shall study Stefan’s law of radiation, Newton’s law of cooling, derivation of Newton’s law of cooling from Stefan’s law and to calculate the temperature of the solar surface. Stefan’s Law: Statement: The heat energy radiated per unit time per unit area […]
Science > Physics > Radiation > Concept of Black Body In this article, we shall study the concept of a black body and its realization in practice. Perfectly Black Body: A body which absorbs all the radiant heat incident upon it is called a perfectly black body. Thus the coefficient of absorption of a perfectly […]
Science > Physics > Radiation > Kirchhoff’s law of Radiation In this article, we shall study Kirchhoff’s law of radiation and its theoretical and experimental proof. Statement: The ratio of the emissive power to the coefficient of absorption is constant for all substances at a given temperature and is equal to the emissive power of […]
Science > Physics > Radiation > Introduction to Radiation The different modes of heat transfer are conduction, convection, and radiation. In this article. we shall study radiation. Radiation: Radiation is a process of transfer of heat in the form of electromagnetic waves for which material medium is not necessary. Radiant Heat: The thermal energy which […]
Science > Physics > Rotational Motion > Numerical Problems on Kinetic Energy and Angular Momentum In this article, we shall study problems based on the change in kinetic energy and the change in angular momentum of a rotating body. Example – 01: A disc begins to rotate from rest with a constant angular acceleration of […]
Science > Physics > Rotational Motion > Angular Momentum In this article, we shall study important physical quantity related to the rotational motion called the angular momentum. The angular momentum of a rigid body about a given axis is defined as the product of its moment of inertia about the given axis and its angular […]
Science > Chemistry > Solid State > Semiconductors On the basis of electrical conductivity, substances can be classified into three types conductors, insulators, and semiconductors. In this article, we shall have a brief idea of semiconductors. Semiconductors are the substances whose conductivity lies between the conductors and insulators e.g. Germanium, Silicon, etc. They are covalent solids. […]
Science > Chemistry > Solid State > Electrical Properties of Solids In the last article, we have studied the dielectric properties of solids. In this article, we shall study the electrical properties of solids. Electrical Conductivity: The electrical conductivity of solids is due to the motion of electron or positive holes. The conductivity due to the motion […]