When photons shine onto the very thin n-type wafer on top, they penetrate all the way down to the p/n junction where the energy from one photon liberates one electron, creating a hole where it used to be. The video calls this electron/hole generation.
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A: electron is present in 4 p orbital to find : possible sets of quantum states
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- Electron diffractometers help us understand the structure of matter. Material is covered in an array of parallel nano-scale metal wires with unknown spacing. A beam of electrons, accelerated through a potential of 20.80 kV produces a pattern of electron impacts on a distant screen with a central bright peak with two smaller peaks. The angular position of the smaller peaks is 25.20 degrees relative to the central peak. What is the spacing of the wires? You may treat the electron as non-relativistic. (Answer in meters)7c.1. Show that the energy bandwidth or the difference between the maximum and minimum values of total energies for simple cubic crystal is 12y.The maximum characteristic x-ray photon energy comes from the capture of a free electron into a K shell vacancy.What is this photon energy in keV for tungsten, assuming the free electron has no initial kinetic energy?
- Two transition between three closest rotational levels (3 to 1 and then 2 to 1 ) correspond to cmission of photons with the wavelength 200microns ( transition from level 3 to 2) and 400 microns (transition from level 2 to 1). What are orbital quantum numbers corresponding to these levels (levels numbering and orbital quantum numbers are different things)?Galaxies tend to be strong emitters of Lyman a photons (from the n = 2 to n = 1 transition in atomic hydrogen). But the intergalactic medium—the very thin gas between the galaxies—tends to absorb Lyman a photons. What can you infer from these observations about the temperature in these two environments? Explain.We can approximate an electron moving in a nanowire (a small, thin wire) as a one-dimensional infi nite square-well potential. Let the wire be 2.0 μm long. The nanowire is cooled to a temperature of 13 K, and we assume the electron’s average kinetic energy is that of gas molecules at this temperature ( 3kT/2). (a) What are the three lowest possible energy levels of the electrons? (b) What is the approximate quantum number of electrons moving in the wire?
- A thin solid barrier in the xy-plane has a 12.6µm diameter circular hole. An electron traveling in the z-direction with vx 0.00m/s passes through the hole. Afterward, within what range is vx likely to be?High-energy photons propagating through space can convert into electron-positron pairs by scattering with cosmic microwave background (CMB) photons. Taking the average CMB temperature of 2.8 K, a typical CMB photon will have an energy of roughly 7 x 10-4 eV. Calculate the minimum energy required for the high-energy photon to produce an electron-positron pair (me = 511 keV) if a. the CMB photon momentum is perpendicular to that of the high-energy photonYou are working as a demonstration assistant for a physics professor. She wants to demonstrate to her students the buildup of the interference pattern for single electrons passing through a double slit. Her source of electrons will be a certain vacuum tube, in which electrons evaporate from a hot cathode at a slow, steady rate and accelerate from rest through a potential difference of 45.0 V. After being accelerated, they travel through a fieldfree and evacuated region before they pass through the double slits and fall on a screen to produce an interference pattern. To ensure that only one electron at a time is passing through the slits, she wants the electrons to be separated in space by d 5 1.00 cm (perpendicular to the barrier containing the slits) as they approach the slit. She asks you to determine the maximum value for the beam current that will assure that only one electron at a time passes through the slits.
- a) The bandwidth of silicon is 1.12 eV. Photon that can create a hole-electron pair in silicon Calculate the maximum value the wavelength can take. Photon energy-wave for silicon by drawing the graph showing the relationship between the length of the energy can be benefited and Indicate the parts that cannot be used with the reasons. b) The physical mechanism of generating electrical energy from a photovoltaic structure is the electric field and Explain in the context of electrons.An electron confined in a box of width 0.360nm makes a transition from the n = 1 to n = 4 level by absorbing a photon. Calculate the wavelength of this photon.How many electrons can occupy the system with l=0, l=2 and l=4. What is number of possibleorientations of the orbital angular momentum with l=4? What is the smallest z-component of theorbital angular momentum?