Category: Facts

Stefan’s Law of Radiation

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 […]

Physics

Concept of Black Body

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 […]

Physics

Kirchhoff’s law of Radiation

Post author By Hemant More
Post date February 3, 2020
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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 […]

Tags absorptivity, Adiathermanous, Coefficient of absorption, Coefficient of emission, Coefficient of reflectin, Coefficient of transmission, Diathermanous, Emissive Power, Emissivity, Kirchhoff's law, Prevost theory of heat exchanges, Radiation, Radient heat, Reflectivity, Ritchie's experiment, Transmtability

Physics

Introduction to Radiation

Post author By Hemant More
Post date February 3, 2020
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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 […]

Tags absorptivity, Adiathermanous, Coefficient of absorption, Coefficient of emission, Coefficient of reflectin, Coefficient of transmission, Diathermanous, Emissive Power, Emissivity, Prevost theory of heat excahnges, Radiation, Radient heat, Reflectivity, Transmtability

Physics

Numerical Problems on Kinetic Energy and Angular Momentum

Post author By Hemant More
Post date February 3, 2020
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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 […]

Tags Angular momentum, Axis of rotation, Conservation of Angular Momentum, Kinetic energy, Moment of inertia, Parallel Axes Theorem, Perpendicular Axes Theorem, Physical significance, Principle of Parallel Axes, Principle of Perpendicular Axes, Radius of gyration, Rigid body, Rotational motion, Torque

Physics

Angular Momentum

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 […]

Tags Angular momentum, Axis of rotation, Conservation of Angular Momentum, Kinetic energy, Moment of inertia, Parallel Axes Theorem, Perpendicular Axes Theorem, Physical significance, Principle of Parallel Axes, Principle of Perpendicular Axes, Radius of gyration, Rigid body, Rotational motion, Torque

Physical Chemistry

Semiconductors

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. […]

Tags Chemistry, Conduction band, Conductors, Doping, Electrical conductivity, Electrical properties, Electricity, Extrinsic Semiconductors, Insulators, Intrinsic semiconductors, Metallic bonds, N-type semiconductors, P-type semiconductors, Pure silicon crystal, Semiconductors, Solid-state, Valence band

Physical Chemistry

Electrical Properties of Solids

Post author By Hemant More
Post date February 2, 2020
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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 […]

Tags Chemistry, Conduction band, Conductors, Electrical conductivity, Electrical properties, Electricity, Insulators, Metallic bonds, Semiconductors, Solid-state, Valence band

Physical Chemistry

Dielectric Properties of Solids

Post author By Hemant More
Post date February 2, 2020
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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 […]

Tags Antiferro electricity, Chemistry, Dielectric, Dielectric property, Ferroelectricity, Piezoelectricity, Pyroelectricity, Solid-state

Criminology

The Schools of Criminology

Post author By Hemant More
Post date February 2, 2020
2 Comments on The Schools of Criminology

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 […]