3. Phosphorous atoms, at a concentration of 5x1021cm-3, are added to a pure sample of intrinsic...
3. Phosphorous atoms, at a concentration of 5x1021cm-3, are added to a pure sample of intrinsic silicon where each phosphorous atom replaces one silicon atom. Assume that phosphorous atoms are distributed homogeneously throughout the silicon sample. What is the atomic fraction of phosphorous in the resulting material? What is the fraction by weight of phosphorous in the resulting material?
4. It is desired to produce x-ray radiation with a wavelength of 1.5A. These x-rays are generated by colliding high energy electrons onto a target. Through what potential voltage difference must the electron be accelerated in vacuum so that it can, upon colliding with a target, generate such a photon? Assume that all of the electron energy is transferred to the photon.
Homework Answers
4. E = h nu = hc/lambda
= [6.626 x 10-34 J s](3 x 108 m/s) / [1.5 x
10-10 m]
= 1.3252 x 10-15 J
This converts to 8.3 keV, so the required potential difference is
8.3 kV.
3. Need correct numerical quantities.
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3. Phosphorous atoms, at a concentration of 5x1021cm-3, are
added to a pure sample of intrinsic...
Problem 16. Find the maximum energy in eV of an x-ray photon produced by electrons accelerated...
Problem 16. Find the maximum energy in eV of an x-ray photon produced by electrons accelerated through a potential difference of 50.0 kV in a CRT like the one show below. Metal target X rays High- voltage source Vacuum Electrons Heated filament Filament voltage X rays are produced when energetic electrons strike the copper anode of this cathode ray tube (CRT). Electrons (shown here as separate particles) interact individually with the material they strike, sometimes producing photons of EM radiation.
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5. (20 points) A Silicon sample contains a small amount (1018 atoms/cm) of phosphorous (P) impurity....
5. (20 points) A Silicon sample contains a small amount (1018 atoms/cm) of phosphorous (P) impurity. (a) What is the majority charge carrier at room temperature? (b) Calculate the resistivity of this material at room temperature. Please show any assumption used in calculation. The mobility of this charge carrier is 700 cm /Vs at room temperature. (e) Show schematically the temperature effects on the mobility, concentration and conductivity of this semiconductor. 6. (20 points) For Mºsc, show schematically (a) the...
hello please answer all questions or at least the first six questions. please type! thanks 7....
hello please answer all questions or at least the first six
questions. please type! thanks
7. Define exothermic and endothermic. What is the sign on q for each type of reaction? 8. A dental hygienist uses x-rays (I 0.100 nm) to take a series of dental radiographs while the patient listens to a radio station ( 325 cm) and looks out the window at the blue sky (l 473 nm). What is the frequency (in s') of the electromagnetic radiation...
2). Rough estimation of the diameter of an aluminum atom: Given aluminum density as p-2.7*10 kg/m',...
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**Please Show All The Steps** As I mentioned in the class assume that we have a...
**Please Show All The Steps**
As I mentioned in the class assume that we have a GaAs (Gallium
Arsenide) sample which was doped with excessive As to produce a
resistivity of 0.05 Ωm. Owing to the presence of an unknown
acceptor impurity the actual resistivity was 0.06Ωm, the sample
remaining n-type. What were the concentrations of donors and
acceptors present?
(Please take μe=0.85 m2/Vs and assume that all impurity atoms
are ionized)
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CHEM 1033, Sample Exam II (Homework) Chapters 3,4,6 Name: 1. What volume of 0.132 M KOH...
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Problem 16. Find the maximum energy in eV of an x-ray photon produced by electrons accelerated through a potential difference of 50.0 kV in a CRT like the one show below. Metal target X rays High- voltage source Vacuum Electrons Heated filament Filament voltage X rays are produced when energetic electrons strike the copper anode of this cathode ray tube (CRT). Electrons (shown here as separate particles) interact individually with the material they strike, sometimes producing photons of EM radiation.
5. (20 points) A Silicon sample contains a small amount (1018 atoms/cm) of phosphorous (P) impurity. (a) What is the majority charge carrier at room temperature? (b) Calculate the resistivity of this material at room temperature. Please show any assumption used in calculation. The mobility of this charge carrier is 700 cm /Vs at room temperature. (e) Show schematically the temperature effects on the mobility, concentration and conductivity of this semiconductor. 6. (20 points) For Mºsc, show schematically (a) the...
hello please answer all questions or at least the first six
questions. please type! thanks
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2). Rough estimation of the diameter of an aluminum atom: Given aluminum density as p-2.7*10 kg/m', atomic weight is 27 (i.e. the mass of 1 mole of aluminum atoms is 27g. Imole 6.02x10 ). Assume atoms of aluminum metal are spherical with spaces in between the aluminum atoms take up 74.1% of the volume of the material. What is the diameter of an aluminum atom? (Note: Volume of a sphere with radius ris: V-(4/3)xr) 4. (20") (1). In E-beam lithography,...
EENG 245 Physical electronics HW 1 1) The NaCl crystal is cubic, and can be described as follows. Na atoms sit at the corners and faces of a cube, and Cl atoms sit in between two Na atoms. This means that a Clatom is found half-way along each of the cube edges, and there is a Cl in the center of the cube. (We could also have described the lattice by interchanging Na and Cl in the description above.) Another...
**Please Show All The Steps**
As I mentioned in the class assume that we have a GaAs (Gallium
Arsenide) sample which was doped with excessive As to produce a
resistivity of 0.05 Ωm. Owing to the presence of an unknown
acceptor impurity the actual resistivity was 0.06Ωm, the sample
remaining n-type. What were the concentrations of donors and
acceptors present?
(Please take μe=0.85 m2/Vs and assume that all impurity atoms
are ionized)
PHYSICAL CONSTANTS Avagadro's Number NA- 6.02 x 10*23...
CHEM 1033, Sample Exam II (Homework) Chapters 3,4,6 Name: 1. What volume of 0.132 M KOH solution would react completely with 25.8 ml. of 0.198 M HCl according to the following cquation? HCI+KOH --->KCI+H.O a) 86.4 ml. b) 25.7 ml. c) 38.7 ml d) 17.2 ml. 2. Which one of the following is a strong soluble base? a) Ni(OH): b) Mg(OH): c) RLOH d) ChOH) c) Fe(OH) 3. Which one of the following is a strong acid? a) HF b)...
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