Tag: Index

  • Brillouin Scattering

    Introduction Brillouin scattering is a phenomenon in physics involving the interaction of light with material waves within a medium. This interaction causes the light to be scattered and its frequency to shift, an effect known as the Brillouin shift. Basics of Light Scattering When light is incident on a medium, it can be absorbed, transmitted,…

  • Ultrasonics

    Introduction to Ultrasonics Ultrasonics refers to the study and application of mechanical waves with a frequency above the upper limit of human hearing, typically considered to be around 20 kHz. These waves can propagate through various media, including gases, liquids, and solids. Basics of Sound Waves Sound waves are longitudinal waves that travel through a…

  • Shadows

    Introduction In the study of light and shadows, two terms are of key importance: umbra and penumbra. The umbra is the darkest part of a shadow, while the penumbra is a lighter shadow that appears when some but not all of the light source is blocked. Physics of Light and Shadows When light encounters an…

  • Weightlessness

    Introduction Weightlessness is a condition experienced by a body when it is free-falling under the influence of a gravitational field, with no other forces (like the normal force) to counteract it. Despite the name, weightlessness doesn’t mean that an object’s weight becomes zero, but rather it refers to the feeling of having no weight because…

  • Spherical Harmonics

    Introduction Spherical harmonics are mathematical functions that play a significant role in various fields, including quantum mechanics, electrodynamics, and computer graphics. They arise when solving Laplace’s equation in spherical coordinates, leading to a separation of variables solution. Definition and Mathematical Formulation of Spherical Harmonics Spherical harmonics can be defined in terms of the associated Legendre…

  • Yttrium Barium Copper Oxide (YBCO)

    Introduction Yttrium Barium Copper Oxide (YBCO) is a type of cuprate high-temperature superconductor characterized by the formula (often abbreviated to Y-123). These materials exhibit superconductivity—a phenomenon characterized by the complete absence of electrical resistance—at temperatures significantly higher than traditional superconductors, often above the boiling point of liquid nitrogen (-196 °C or 77 K), which makes…

  • Oersted (Unit)

    Introduction The Oersted (Oe) is a unit of magnetic field strength in the centimeter-gram-second (CGS) system of units. Named after the Danish physicist Hans Christian Ørsted, this unit has been widely used in the field of magnetism. Definition and Measurement Magnetic Field Strength Magnetic field strength, also known as magnetic field intensity, is a measure…

  • Cauchy-Riemann Equations

    Introduction The Cauchy-Riemann equations are a pair of partial differential equations which provide necessary and sufficient conditions for a complex function to be holomorphic. A holomorphic function is complex differentiable, i.e., it is a function that is differentiable when regarded as a function on the real plane . Complex Functions and Differentiability A complex function…

  • Dot Product

    Introduction The dot product, also known as the scalar product, is a fundamental operation in the field of vector algebra. It operates on two vectors to produce a scalar, or single number. Definition of the Dot Product For two vectors and , the dot product is defined as: This operation multiplies corresponding components of and…

  • Cross Product

    Introduction The cross product (also known as the vector product) is an operation on two vectors in three-dimensional space. It results in a vector that is orthogonal (perpendicular) to both of the original vectors, with a magnitude equal to the area of the parallelogram that the vectors span. Basics of the Cross Product Given two…