Author: Tru Physics
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Dyne (unit)
Introduction The dyne is a unit of force in the centimetre-gram-second (CGS) system of units, which is a part of the metric system. This unit is not widely used in contemporary physics, having been largely superseded by the newton, the SI unit for force. However, the dyne still finds occasional use in certain areas of…
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Erg (unit)
Introduction The erg is a unit of energy and mechanical work in the centimetre-gram-second (CGS) system of units, which is a part of the metric system. While not as widely used today, it is still important in specific fields of physics like astrophysics and physics of plasmas. Defining an Erg One erg is the amount…
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Hawking Radiation
Introduction Hawking Radiation is a theoretical prediction made by physicist Stephen Hawking in 1974. It is a quantum mechanical phenomenon in which black holes emit thermal radiation due to quantum effects near the event horizon. This stands in stark contrast to the classical prediction of general relativity, which asserts that black holes should not emit…
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Einstein-de Haas Effect
Introduction The Einstein-de Haas effect is a physical phenomenon that demonstrates the connection between the angular momentum and the magnetic moment of a ferromagnetic material. It provides experimental evidence for the idea that spin angular momentum is indeed of the same nature as the classical angular momentum. The Basic Principle of the Einstein-de Haas Effect…
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Wireless Energy Transfer
Introduction Wireless energy transfer refers to the process of transmitting electrical energy from a power source to an electrical load, without the use of physical connectors. It’s a broad field with applications ranging from wireless charging of devices, electric vehicles, medical implants to power transfer in remote or inaccessible locations. Basic Principle of Wireless Energy…
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Work Function
Introduction In the field of physics, the work function is a fundamental concept related to the behavior of electrons in a material. It represents the minimum energy required to remove an electron from a solid to a point in the vacuum immediately outside the solid surface. Definition and Expression The work function () is defined…
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Tycho Brahe’s Observations
Introduction Tycho Brahe (1546-1601) was a Danish nobleman and one of the most important astronomers of the late 16th century. Known for his comprehensive and accurate observations of the heavens, his data paved the way for Johannes Kepler to formulate his laws of planetary motion. Brahe’s Observational Equipment Brahe’s observations were carried out with naked-eye…
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Thermal Expansion
Introduction Thermal expansion refers to the tendency of matter to change its shape, area, and volume in response to a change in temperature. This phenomenon occurs due to the increased kinetic energy of particles that cause them to move more and occupy a larger volume. Linear Thermal Expansion The simplest form of thermal expansion is…
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Viscous Drag
Introduction Viscous drag is a force that opposes the motion of an object through a fluid (like a liquid or gas), due to the viscosity of the fluid. This force plays a significant role in a variety of physical systems, from the flow of blood in the body to the flight of an airplane. Basic…
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Vacuum Energy
Introduction In quantum field theory, vacuum energy is the zero-point energy of all the fields in space. This includes both the electromagnetic field and the other fundamental fields. It’s the lowest possible energy that a quantum mechanical physical system may have and is the energy of empty space. Zero-Point Energy The notion of vacuum energy…