Lesson 13
... rate at which electrons flow past a specific point in a circuit SI unit is ampere (A) POTENTIAL DIFFERENCE (V) difference in electric potential between two points in a circuit also called voltage SI unit is volts (V) ...
... rate at which electrons flow past a specific point in a circuit SI unit is ampere (A) POTENTIAL DIFFERENCE (V) difference in electric potential between two points in a circuit also called voltage SI unit is volts (V) ...
Planck`s “quantum of action” from the photoelectric effect (line
... constant value and current is obtained, because more electrons are then being emitted. It can also be observed that when the potential is reduced to zero, there is still a current in the tube. Even though there is no electric field to draw them to the anode, many of the photoelectrons still reach th ...
... constant value and current is obtained, because more electrons are then being emitted. It can also be observed that when the potential is reduced to zero, there is still a current in the tube. Even though there is no electric field to draw them to the anode, many of the photoelectrons still reach th ...
曾撰文称:到2025年白光LED将占照明灯具市场的55%以上份额
... As we saw in the last section, free electrons moving across a diode can fall into empty holes from the P-type layer. This involves a drop from the conduction band to a lower orbital, so the electrons release energy in the form of photons. This happens in any diode, but you can only see the photons w ...
... As we saw in the last section, free electrons moving across a diode can fall into empty holes from the P-type layer. This involves a drop from the conduction band to a lower orbital, so the electrons release energy in the form of photons. This happens in any diode, but you can only see the photons w ...
franck-hertz apparatus
... and X output sockets to the corresponding Y, ground, and X input sockets of an oscilloscope. Set the oscilloscope to X-Y mode and switch on the power of oscilloscope. Adjust the Y and X positions to make the scan baseline lie at the bottom of the screen, and adjust the X Gain to make scan baseline 1 ...
... and X output sockets to the corresponding Y, ground, and X input sockets of an oscilloscope. Set the oscilloscope to X-Y mode and switch on the power of oscilloscope. Adjust the Y and X positions to make the scan baseline lie at the bottom of the screen, and adjust the X Gain to make scan baseline 1 ...
Physics of a BJT
... Injection of Electrons into Depletion Region Into depletion region on the p side. ...
... Injection of Electrons into Depletion Region Into depletion region on the p side. ...
oscilloscopes in electronic instrumentation
... repulsive force is created by applying a negative voltage to the control grid (in CRT, voltages applied to various grids are stated with respect to cathode, which is taken as common point). This negative control voltage can be made variable. Deflection System: When the electron beam is accelerated i ...
... repulsive force is created by applying a negative voltage to the control grid (in CRT, voltages applied to various grids are stated with respect to cathode, which is taken as common point). This negative control voltage can be made variable. Deflection System: When the electron beam is accelerated i ...
Need for Development of Quantum Mechanics
... Calculate de-Broglie wavelength of a proton moving with 1/10th velocity of light. The electron in hydrogen atom may be thought of as confined to a radius of 5x10-11m.Calculate the minimum uncertainty in the momentum of the electron. Also calculate the minimum kinetic energy of the electron. A radar ...
... Calculate de-Broglie wavelength of a proton moving with 1/10th velocity of light. The electron in hydrogen atom may be thought of as confined to a radius of 5x10-11m.Calculate the minimum uncertainty in the momentum of the electron. Also calculate the minimum kinetic energy of the electron. A radar ...
Photomultiplier
Photomultiplier tubes (photomultipliers or PMTs for short), members of the class of vacuum tubes, and more specifically vacuum phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. These detectors multiply the current produced by incident light by as much as 100 million times (i.e., 160 dB), in multiple dynode stages, enabling (for example) individual photons to be detected when the incident flux of light is very low. Unlike most vacuum tubes, they are not obsolete.The combination of high gain, low noise, high frequency response or, equivalently, ultra-fast response, and large area of collection has maintained photomultipliers an essential place in nuclear and particle physics, astronomy, medical diagnostics including blood tests, medical imaging, motion picture film scanning (telecine), radar jamming, and high-end image scanners known as drum scanners. Elements of photomultiplier technology, when integrated differently, are the basis of night vision devices.Semiconductor devices, particularly avalanche photodiodes, are alternatives to photomultipliers; however, photomultipliers are uniquely well-suited for applications requiring low-noise, high-sensitivity detection of light that is imperfectly collimated.