Photoelectric Effect: The Quantization of Energy and Light
... graph above – V0 does not depend on the light intensity. If we increase the rate of energy falling on the metal, we don't increase the kinetic energy of the electrons ejected! Einstein theorized that light energy, rather than being spread out like a wave, was quantized into discrete amounts (quanta) ...
... graph above – V0 does not depend on the light intensity. If we increase the rate of energy falling on the metal, we don't increase the kinetic energy of the electrons ejected! Einstein theorized that light energy, rather than being spread out like a wave, was quantized into discrete amounts (quanta) ...
Lab #1: Ohm`s Law (and not Ohm`s Law)
... • Because of the “Pauli exclusion principal” no 2 electrons can have the same quantum numbers. • The distributions of electron energies depends on the temperature. The highest energy when T=0 is called the Fermi Energy (EF). • some materials can be made into semi conductors by adding small amounts o ...
... • Because of the “Pauli exclusion principal” no 2 electrons can have the same quantum numbers. • The distributions of electron energies depends on the temperature. The highest energy when T=0 is called the Fermi Energy (EF). • some materials can be made into semi conductors by adding small amounts o ...
Electromagnetic Radiation
... EM energy displays particle-like behavior, and sometimes it acts like a wave; it all depends on what sort of experiment you're doing. This is known as wave/particle duality, and, like it or not, physicists have just been forced to ...
... EM energy displays particle-like behavior, and sometimes it acts like a wave; it all depends on what sort of experiment you're doing. This is known as wave/particle duality, and, like it or not, physicists have just been forced to ...
EM Electricity Lecture Notes Page
... EM energy displays particle-like behavior, and sometimes it acts like a wave; it all depends on what sort of experiment you're doing. This is known as wave/particle duality, and, like it or not, physicists have just been forced to ...
... EM energy displays particle-like behavior, and sometimes it acts like a wave; it all depends on what sort of experiment you're doing. This is known as wave/particle duality, and, like it or not, physicists have just been forced to ...
Atomic Structure
... Electrons, beta rays Protons Alphas: nuclei of helium atoms, composed of two protons and two neutrons. They are positively charged, and are usually emitted when heavy radioactive isotopes, such as uranium, break down. Heavy Ions: nuclei of any atoms that have been stripped of their electrons. They m ...
... Electrons, beta rays Protons Alphas: nuclei of helium atoms, composed of two protons and two neutrons. They are positively charged, and are usually emitted when heavy radioactive isotopes, such as uranium, break down. Heavy Ions: nuclei of any atoms that have been stripped of their electrons. They m ...
ELECTROCHEMICAL CELLS
... cell. In an electrochemical cell, the oxidation process and the reduction process are separated into two half-cells connected by an external wire. The half-cell with the oxidation process is losing negative charge (e loss) while the half-cell with the reduction process is gaining negative ...
... cell. In an electrochemical cell, the oxidation process and the reduction process are separated into two half-cells connected by an external wire. The half-cell with the oxidation process is losing negative charge (e loss) while the half-cell with the reduction process is gaining negative ...
V - Mr. B. Gillis`s Weblog
... right next to the first. Be sure to match up positive terminal with negative terminal Do you notice any difference? Add a second light bulb to the circuit, keeping only one pathway for electricity to follow What do you observe now? ...
... right next to the first. Be sure to match up positive terminal with negative terminal Do you notice any difference? Add a second light bulb to the circuit, keeping only one pathway for electricity to follow What do you observe now? ...
Power Electronics Applications
... In the p region, the free electron is swept across the depletion region by the electric field into the n region. In the n region, the hole is swept across the depletion region by the electric field into the p region. Electrons accumulate in the n region, creating a negative charge; and holes accumu ...
... In the p region, the free electron is swept across the depletion region by the electric field into the n region. In the n region, the hole is swept across the depletion region by the electric field into the p region. Electrons accumulate in the n region, creating a negative charge; and holes accumu ...
Chemistry Honors * Reduction Potentials Lab Name:
... The device below shows a voltmeter, reading 1.10 V, hooked up to the external wire. A typical AA battery has a voltage of 1.5 V, so this electrochemical cell below could almost power an electrical device requiring a AA battery. Just replace the voltmeter with that device, and it would work! ...
... The device below shows a voltmeter, reading 1.10 V, hooked up to the external wire. A typical AA battery has a voltage of 1.5 V, so this electrochemical cell below could almost power an electrical device requiring a AA battery. Just replace the voltmeter with that device, and it would work! ...
Solar Cells and Circuits Instructions:
... be complete, so if one device stops working or is disconnected, the all other devices in the series circuit will stop working. When circuits are wired in parallel, the voltage of each panel remains the same and the current of each panel is added. In a parallel circuit, each device has its own circui ...
... be complete, so if one device stops working or is disconnected, the all other devices in the series circuit will stop working. When circuits are wired in parallel, the voltage of each panel remains the same and the current of each panel is added. In a parallel circuit, each device has its own circui ...
Shockley–Queisser limit
In physics, the Shockley–Queisser limit or detailed balance limit refers to the maximum theoretical efficiency of a solar cell using a p-n junction to collect power from the cell. It was first calculated by William Shockley and Hans Queisser at Shockley Semiconductor in 1961. The limit is one of the most fundamental to solar energy production, and is considered to be one of the most important contributions in the field.The limit places maximum solar conversion efficiency around 33.7% assuming a single p-n junction with a band gap of 1.34 eV (using an AM 1.5 solar spectrum). That is, of all the power contained in sunlight falling on an ideal solar cell (about 1000 W/m²), only 33.7% of that could ever be turned into electricity (337 W/m²). The most popular solar cell material, silicon, has a less favourable band gap of 1.1 eV, resulting in a maximum efficiency of 33.3%. Modern commercial mono-crystalline solar cells produce about 24% conversion efficiency, the losses due largely to practical concerns like reflection off the front surface and light blockage from the thin wires on its surface.The Shockley–Queisser limit only applies to cells with a single p-n junction; cells with multiple layers can outperform this limit. In the extreme, with an infinite number of layers, the corresponding limit is 86% using concentrated sunlight.