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 […]
Science > Chemistry > Solid State > Magnetic Properties of Solids In the last article, we have studied the magnetic properties of solids. In this article, we shall study the dielectric properties of solids. Source of Dielectric Properties of Solids: In insulators, electrons in the individual atom or ion are bound to corresponding nuclei. Hence […]
In this article, we shall enumerate different schools of criminology and study pre-classical school or demonological school. Remaining schools of criminology will be discussed in subsequent articles. There are countless theories but they can be clearly classified into two groups: Scientific Theories which are considered “true” or “facts” because they have been found experimentally to […]
Science > Chemistry > Solid State > Magnetic Properties of Solids In this article, we shall study the magnetic properties of solids, classification of solids on the basis of their magnetic properties. Every substance has some magnetic properties associated with it. The origin of these properties lies in the magnetic moments associated with the electrons. […]
Science > Chemistry > Solid State > Defects in Crystal Structure In this article, we shall study defects in the crystal structure, sources of defects and their types. Source of Defects in Crystal Structure: At absolute zero, crystals tend to have a tendency to have a perfectly ordered arrangement. This arrangement at absolute zero represents the […]
Science > Chemistry > Solid State > Radius Ratio and its Significance The ratio of the radius of cations (r+) to the radius of the anion (r–) is known as the radius ratio of the ionic solid. The significance of radius ratio: It is useful in predicting the structure of ionic solids. The structure of […]