Episode 103 - Teaching Advanced Physics
... Danger or not? Torch batteries are not dangerous because although they can produce relatively large currents (in low resistance circuits) they do so at safe low potential differences, and only a small current actually flows through the body. An electrostatic generator like the Van de Graaff (or like ...
... Danger or not? Torch batteries are not dangerous because although they can produce relatively large currents (in low resistance circuits) they do so at safe low potential differences, and only a small current actually flows through the body. An electrostatic generator like the Van de Graaff (or like ...
STM Scanning tunneling microscope History
... History • The STM was invented 1981 by Gerd Binnig and Heinrich Rohrer. • They received the Nobel prize in physics in 1986 for the STM • The STM was first used in showing its atomic scale resolution in a image of silicon 7x7 restructed (111) surface. ...
... History • The STM was invented 1981 by Gerd Binnig and Heinrich Rohrer. • They received the Nobel prize in physics in 1986 for the STM • The STM was first used in showing its atomic scale resolution in a image of silicon 7x7 restructed (111) surface. ...
Chemistry 201/211 - Department of Chemistry | Oregon State
... a.) Classical mechanics predicts that light impinging on a metal surface could never eject an electron, no matter what the intensity or frequency of the light. b.) Quantum mechanics predicts that light with a frequency less than a critical value cannot eject an electron from the surface, no matter w ...
... a.) Classical mechanics predicts that light impinging on a metal surface could never eject an electron, no matter what the intensity or frequency of the light. b.) Quantum mechanics predicts that light with a frequency less than a critical value cannot eject an electron from the surface, no matter w ...
UE502040 Franck-Hertz Experiment for Neon
... In the Franck-Hertz experiment neon atoms are excited by inelastic collision with electrons. The excited atoms emit visible light that can be viewed directly. Thus it is possible to detect zones where the light and therefore the excitation is more intense. The distribution of such zones between the ...
... In the Franck-Hertz experiment neon atoms are excited by inelastic collision with electrons. The excited atoms emit visible light that can be viewed directly. Thus it is possible to detect zones where the light and therefore the excitation is more intense. The distribution of such zones between the ...
Tutorial 3Answer 1. Zener diode has two types of reverse
... The basic operation of LED is as illustrated in Fig. 3-14: “When the device is forward-biased, electrons cross the p-n junction from the n-type material and recombine with holes in the p-type material. These free electrons are in the conduction band and at a higher energy than the holes in the valen ...
... The basic operation of LED is as illustrated in Fig. 3-14: “When the device is forward-biased, electrons cross the p-n junction from the n-type material and recombine with holes in the p-type material. These free electrons are in the conduction band and at a higher energy than the holes in the valen ...
E2 Rev
... homework also. I will provide the activity series. You should know solubility rules 1-3 and any equations we have discussed (the Bohr equation will be provided). I will also provide any necessary constants. Exam covers material in textbook sections 3.5 (only material not covered in exam 1), 4.1 – 4. ...
... homework also. I will provide the activity series. You should know solubility rules 1-3 and any equations we have discussed (the Bohr equation will be provided). I will also provide any necessary constants. Exam covers material in textbook sections 3.5 (only material not covered in exam 1), 4.1 – 4. ...
Choosing the Detector for your Unique Light Sensing Application
... millivolts across an output 50 ohm load resistor for a single incident photon. Photomultiplier tubes provide the ultimate in detection sensitivity. They can sense the smallest amount of optical energy there is: an individual photon. When cooled, it can be ...
... millivolts across an output 50 ohm load resistor for a single incident photon. Photomultiplier tubes provide the ultimate in detection sensitivity. They can sense the smallest amount of optical energy there is: an individual photon. When cooled, it can be ...
Modern Physics Laboratory
... In this experiment electrons acquire their kinetic energy by being accelerated (essentially from rest) through a potential difference Va , where they lose potential energy eVa and gain a corresponding amount of kinetic energy, so that K = eVa . ...
... In this experiment electrons acquire their kinetic energy by being accelerated (essentially from rest) through a potential difference Va , where they lose potential energy eVa and gain a corresponding amount of kinetic energy, so that K = eVa . ...
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.