Comments on Charge carrier

electric-field

Reference: Disturbance Theory

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Charge carrier – Wikipedia

In physics, a charge carrier is a particle free to move, carrying an electric charge, especially the particles that carry electric charges in electrical conductors. Examples are electrons, ions and holes. In a conducting medium, an electric field can exert force on these free particles, causing a net motion of the particles through the medium; this is what constitutes an electric current.

A charge shall surround the particle that carries it. An electron is an eddy type configuration within the electromagnetic field. Ions are atoms or molecules that either hold extra charge, or have lost some charge. Holes are lower frequency regions (sinks) in the electromagnetic field. These “particles” are forced into motion by the difference in frequencies of the field. Such particles maintain their configuration and do not merge into surrounding field.

In different conducting media, different particles serve to carry charge:

  • In metals, the charge carriers are electrons. One or two of the valence electrons from each atom is able to move about freely within the crystal structure of the metal. The free electrons are referred to as conduction electrons, and the cloud of free electrons is called a Fermi gas.

In metals, the charges that generally belong to atoms, detach and move relatively freely within the lattice of atoms in the metal. These charges move like eddies at a higher frequency.

  • In electrolytes, such as salt water, the charge carriers are ions, which are atoms or molecules that have gained or lost electrons so they are electrically charged. Atoms that have gained electrons so they are negatively charged are called anions, atoms that have lost electrons so they are positively charged are called cations. Cations and anions of the dissociated liquid also serve as charge carriers in melted ionic solids (see e.g. the Hall–Héroult process for an example of electrolysis of a melted ionic solid). Proton conductors are electrolytic conductors employing positive hydrogen ions as carriers.

In electrolytes, parts of molecules become loose from each other and the frequency gradients become stretched. So the positive and negative charges appear far from each other and more visible.

  • In a plasma, an electrically charged gas which is found in electric arcs through air, neon signs, and the sun and stars, the electrons and cations of ionized gas act as charge carriers.

In plasma, the mechanism is the same as above except that the electromagnetic field is arranged on a different scale.

  • In a vacuum, free electrons can act as charge carriers. In the electronic component known as the vacuum tube (also called valve), the mobile electron cloud is generated by a heated metal cathode, by a process called thermionic emission. When an electric field is applied strong enough to draw the electrons into a beam, this may be referred to as a cathode ray, and is the basis of the cathode ray tube display widely used in televisions and computer monitors until the 2000’s.

The frequency modulation within a field can control the collection and motion of charge.

  • In semiconductors (the material used to make electronic components like transistors and integrated circuits), in addition to electrons, the travelling vacancies in the valence-band electron population (called “holes”), act as mobile positive charges and are treated as charge carriers. Electrons and holes are the charge carriers in semiconductors.

The “holes” are like low frequency sinks in the electromagnetic field. These charges may move like eddies at a lower frequency.

It can be seen that in some conductors, such as ionic solutions and plasmas, there are both positive and negative charge carriers, so an electric current in them consists of the two polarities of carrier moving in opposite directions. In other conductors, such as metals, there are only charge carriers of one polarity, so an electric current in them just consists of charge carriers moving in one direction.

The charge carrier basically carries a stable configuration of frequency gradient.

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Comments on Electric charge

Electron
Reference: Disturbance Theory

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Electric charge – Wikipedia

Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. There are two types of electric charges: positive and negative (commonly carried by protons and electrons respectively). Like charges repel and unlike attract. An absence of net charge is referred to as neutral. An object is negatively charged if it has an excess of electrons, and is otherwise positively charged or uncharged. The SI derived unit of electric charge is the coulomb (C). In electrical engineering, it is also common to use the ampere-hour (Ah), and, in chemistry, it is common to use the elementary charge (e) as a unit. The symbol Q often denotes charge. Early knowledge of how charged substances interact is now called classical electrodynamics, and is still accurate for problems that don’t require consideration of quantum effects.

An electric charge seems to be an eddy in an electromagnetic field that has a higher frequency compared to the surrounding field due to its rapid rotation. Dimensionally, the charge is same as mass. It has lesser frequency than mass.

NOTE: Per dimensional analysis provided by Maxwell, a charge has same dimensional characteristics as mass.

[M] = [Q] = [L3-2]

[L3-2] amounts to “area x acceleration”, which may be interpreted as a two dimensional electromagnetic wave front propagating in the third dimension. Maybe such a wavefront is responsible for the production of light, charge and mass.

The two types of electric charges are at the opposite ends of a frequency gradient. The negative charge forms the higher frequency eddy. It is therefore more concentrated and appears as a particle. The positive charge is the immediately surrounding field of lower frequency. The frequency gradient between negative and positive charge acts as an attractive force. Two similar frequency gradients repel each other.

Absence of net charge means there is no net frequency gradient.

The electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. Electrically charged matter is influenced by, and produces, electromagnetic fields. The interaction between a moving charge and an electromagnetic field is the source of the electromagnetic force, which is one of the four fundamental forces (See also: magnetic field).

Charge is part of the makeup of a subatomic particle. It is conserved like mass is conserved. The charge does not produce the electromagnetic field. The charge is an eddy within the electromagnetic field. The electromagnetic force is the frequency gradient in the electromagnetic field.

Twentieth-century experiments demonstrated that electric charge is quantized; that is, it comes in integer multiples of individual small units called the elementary charge, e, approximately equal to 1.602×10−19 coulombs (except for particles called quarks, which have charges that are integer multiples of (1/3) e). The proton has a charge of +e, and the electron has a charge of −e. The study of charged particles, and how their interactions are mediated by photons, is called quantum electrodynamics.

Electric charge is represented by the electron. The electron is an eddy in the electromagnetic field that has a stable configuration. The charge is quantized in the form of electrons. Quarks are theoretical as they have not been observed so far.

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Classical to Quantum Mechanics

Blackbody Radiation

Reference: Disturbance Theory

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  1. The Classical Mechanics made a transition into Quantum Mechanics at the beginning of 20th century when the interactions between field and matter were studied. The first field-matter interaction was encountered in the Black Body Radiation. The classical equipartition theory failed to account for the energy of the emitted electromagnetic spectrum.

  2. There was a thermodynamic equilibrium observed between the temperature of the body and the spectrum of the electromagnetic field surrounding the body. In other words, the agitation of atoms (temperature) was in equilibrium with the absorption and emission of thermal electromagnetic radiation (spectrum).

  3. The formulae based on classical thermodynamics could either explain the low frequency part of the spectrum (Raleigh-Jean formula), or the high frequency part of the spectrum (Wien’s Distribution formula), but not the entire spectrum at once. Planck found the formula, which could replicate the entire spectrum by ingeniously interpolating between the above two formulae. This was purely an empirical effort based on mathematics. He came up with the explanation for his formula later.

  4. From Derivation of Planck’s radiation law:

    In order to reproduce the formula which he had empirically derived and presented in October 1900, Planck found that he could only do so if he assumed that the radiation was produced by oscillating electrons, which he modelled as oscillating on a massless spring (so-called “harmonic oscillators”). The total energy at any given frequency would be given by the energy of a single oscillator at that frequency multiplied by the number of oscillators oscillating at that frequency.

    However, he had to assume that

    1. The energy of each oscillator was not related to either the square of the amplitude of oscillation or the square of the frequency of oscillation (as it would be in classical physics), but rather just to the frequency, E α ν
    2. The energy of each oscillator could only be a multiple of some fundamental “chunk” of radiation, , so En = nhν where n = 0, 1, 2, 3, 4
    3. The number of oscillators with each energy Ewas given by the Boltzmann distribution, so

      Nn = N0e–nhν/kT

    where N0 is the number of oscillators in the lowest energy state.

    By combining these assumptions, Planck was able in November 1900 to reproduce the exact equation which he had derived empirically in October 1900. In doing so he provided, for the first time, a physical explanation for the observed blackbody curve.

  5. The frequency of the radiation matched the frequency of the “oscillators” in the body. The high frequency oscillators could be activated only when energy proportional to their frequency was available. Therefore, lesser numbers of oscillators were activated at higher frequencies. Planck thus resolved the Ultraviolet catastrophe.

  6. We may postulate that the kinetic and potential states of oscillators produce the electric and magnetic states of radiation respectively. Therefore, the electric state may be related to magnetic state the way the kinetic state is related to potential state. The magnetic state could be a concentrated electric state; and the electric state could be a flowing magnetic state.

  7. Thus an electromagnetic cycle consists of a pulse of energy of magnitude ‘h’. A three-dimensional electromagnetic field is made up of such dynamic pulses.

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Notes on Black-body radiation

Black_body

Reference: Disturbance Theory

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Black body

  1. A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.

  2. A black body in thermal equilibrium (that is, at a constant temperature) emits electromagnetic radiation called black-body radiation.

  3. The radiation has a spectrum that is determined by the temperature alone, not by the body’s shape or composition.

  4. It is extremely difficult to realize a perfect black body, for which, the absorption of radiation is 100%. Transmission and reflection is zero.

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Thermodynamic equilibrium

  1. In thermodynamic equilibrium all kinds of equilibrium hold at once.

  2. It is characterized by no net macroscopic flows of matter or of energy.

  3. Any microscopic exchanges are perfectly balanced.

  4. The temperature is spatially uniform.

  5. Entropy maximizes with equilibrium.

Thermodynamic state

  • A thermodynamic system is a macroscopic object, the microscopic details of which are not explicitly considered in its thermodynamic description.

Internal energy

  • It excludes the kinetic energy of motion of the system as a whole and the potential energy of the system as a whole due to external force fields.

Boltzmann constant

  • The Boltzmann constant (kB or k), which is named after Ludwig Boltzmann, is a physical constant relating the average kinetic energy of particles in a gas with the temperature of the gas. It is the gas constant R divided by the Avogadro constant NA.

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Equipartition theorem

  1. It relates the temperature of a system to its average energies in thermal equilibrium.

  2. It assumes that energy is shared equally among all of its various modes. For example, the average kinetic energy per degree of freedom in translational motion of a molecule should equal that in rotational motion.

  3. It gives the average values of individual components of the energy, such as, the kinetic energy of a particular particle, or the potential energy of a single spring. For example, it predicts that every atom in a monatomic ideal gas has an average kinetic energy of (3/2) kBT in thermal equilibrium.

  4. When the thermal energy kBT is smaller than the quantum energy spacing in a particular degree of freedom (such as at lower temperatures), the average energy and heat capacity of this degree of freedom are less than the values predicted by equipartition.

  5. Such decreases in heat capacity were among the first signs to physicists of the 19th century that classical physics was incorrect and that a new, more subtle, scientific model was required.

  6. Along with other evidence, equipartition’s failure to model black-body radiation—also known as the ultraviolet catastrophe—led Max Planck to suggest that energy in the oscillators in an object, which emit light, were quantized, a revolutionary hypothesis that spurred the development of quantum mechanics and quantum field theory.

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Rayleigh–Jeans law

  1. The Rayleigh–Jeans law revealed an important error in physics theory of the time.

  2. The law predicted an energy output that diverges towards infinity as wavelength approaches zero (as frequency tends to infinity).

  3. Measurements of the spectral emission of actual black bodies revealed that the emission agreed with the Rayleigh–Jeans law at low frequencies but diverged at high frequencies; reaching a maximum and then falling with frequency, so the total energy emitted is finite.

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Ultraviolet catastrophe

  1. The ultraviolet catastrophe was the prediction of classical physics that an ideal black body at thermal equilibrium will emit more energy as the frequency increases.

  2. A blackbody would release an infinite amount of energy, contradicting the principles of conservation of energy.

  3. The ultraviolet catastrophe results from the equipartition theorem of classical statistical mechanics which states that all harmonic oscillator modes (degrees of freedom) of a system at equilibrium have an average energy of (1/2)kT. It assumes that vibrating modes can increase infinitely.

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Black-body radiation

  1. Black-body radiation is the thermal electromagnetic radiation within or surrounding a body.

  2. It has a specific spectrum and intensity that depends only on the body’s temperature.

  3. As its temperature increases the peak of the spectrum shifts from infra-red toward higher frequencies of visible light.

  4. Black-body radiation has a characteristic, continuous frequency spectrum.

  5. If each Fourier mode of the equilibrium radiation in an otherwise empty cavity with perfectly reflective walls is considered as a degree of freedom capable of exchanging energy, then, according to the equipartition theorem of classical physics, there would be an equal amount of energy in each mode.

  6. Since there are an infinite number of modes this implies infinite heat capacity (infinite energy at any non-zero temperature), as well as an unphysical spectrum of emitted radiation that grows without bound with increasing frequency, a problem known as the ultraviolet catastrophe.

  7. Instead, in quantum theory the occupation numbers of the modes are quantized, cutting off the spectrum at high frequency in agreement with experimental observation and resolving the catastrophe. The study of the laws of black bodies and the failure of classical physics to describe them helped establish the foundations of quantum mechanics.

Explanation

  1. The radiation from matter represents a conversion of a body’s thermal energy into electromagnetic energy. At thermal equilibrium, matter emits and absorbs electromagnetic radiation. The electromagnetic radiation has a characteristic frequency distribution that depends on the temperature only.

  2. At thermodynamic equilibrium the amount of every wavelength in every direction of thermal radiation emitted by a body at temperature T is equal to the corresponding amount that the body absorbs because it is surrounded by light at temperature T.

  3. The black-body curve is characteristic of thermal light, which depends only on the temperature of the body. The principle of strict equality of emission and absorption is always upheld in a condition of thermodynamic equilibrium.

  4. By making changes to Wien’s radiation law consistent with thermodynamics and electromagnetism, Planck found a mathematical expression fitting the experimental data satisfactorily. Planck had to assume that the energy of the oscillators in the cavity was quantized, i.e., it existed in integer multiples of some quantity.

  5. Einstein built on this idea and proposed the quantization of electromagnetic radiation itself in 1905 to explain the photoelectric effect.

  6. These theoretical advances eventually resulted in the superseding of classical electromagnetism by quantum electrodynamics. These quanta were called photons and the black-body cavity was thought of as containing a gas of photons.

  7. In addition, it led to the development of quantum probability distributions, called Fermi–Dirac statistics and Bose–Einstein statistics, each applicable to a different class of particles, fermions and bosons.

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Comments on Quantization – Wikipedia

feynman-1

Reference: Disturbance Theory

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Quantization – Wikipedia

In physics, quantization is the process of transition from a classical understanding of physical phenomena to a newer understanding known as quantum mechanics. It is a procedure for constructing a quantum field theory starting from a classical field theory. This is a generalization of the procedure for building quantum mechanics from classical mechanics. One also speaks of field quantization, as in the “quantization of the electromagnetic field”, where one refers to photons as field “quanta” (for instance as light quanta). This procedure is basic to theories of particle physics, nuclear physics, condensed matter physics, and quantum optics.

The concept of quantization starts with cycles that make up the field, where each cycle has the same amount of energy. See Energy and Cycle. The phenomena of cycle leads to the quantization of more complex sub-atomic properties observed within the atom. This does not necessarily mean that these properties are completely discrete. However, the “action at a distance” approach explains all atomic and sub-atomic phenomena with mathematical discreteness quite successfully. This approach has given us Quantum Mechanics.

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Quantum – Wikipedia

In physics, a quantum (plural: quanta) is the minimum amount of any physical entity involved in an interaction. The fundamental notion that a physical property may be “quantized” is referred to as “the hypothesis of quantization”. This means that the magnitude of the physical property can take on only discrete values consisting of integer multiples of one quantum.

The hypothesis of quantization is a mathematical one that uses probability statistics. This hypothesis comes from the belief in “action at a distance”.

For example, a photon is a single quantum of light (or of any other form of electromagnetic radiation), and can be referred to as a “light quantum”. Similarly, the energy of an electron bound within an atom is also quantized, and thus can only exist in certain discrete values. The fact that electrons can only exist at discrete energy levels in an atom causes atoms to be stable, and hence matter in general is stable.

A photon represents the energy equivalent of a certain number of cycles taking part in the photoelectric effect. Since each cycle has the same amount of energy, the energy of cycles that take part in this interaction at the sub-atomic level appears to be discrete. This leads to the perception of a discrete energy particle. We call such an energy particle a photon. Similar considerations apply to energy levels observed within an atom and the electrons.

Quantization is one of the foundations of the much broader physics of quantum mechanics. Quantization of the energy and its influence on how energy and matter interact (quantum electrodynamics) is part of the fundamental framework for understanding and describing nature.

Such quantization is obvious in the interactions between field and matter at sub-atomic and atomic levels, where a mass particle breaks into energy particles called “quanta”.

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