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- The number density of conduction electrons in a metal can be found from the density ρ of the metal, the mass per mole M of the metal, the number of conduction electrons per metal atom, and Avogadro’s number NA. If we assume one conduction electron per atom, which of the following gives the number density of conduction electrons for a given metal? a. NA ρM b.NA ρ/M c. NA M/ρ d. NA /ρMMetals are bonded by metallic bond, that is protons in a sea of electrons which give them their characteristic conductivity. If the electric current flows from one end to the other end using a copper wire to bridge the gap, the extra electron given through the electric current will cause the sea of electrons in the copper to? A. The electrons given will just be deposited in the sea of electrons with nowhere to go B. The electrons given will occupy the space of the electrons that were pushed. C. The electrons given will not flow to the metal because of repulsion. D. The electrons given will travel to the other end through the proton movement.What is the number density of free electron carries in the metallic element nickel if the electrons available for electrical conduction is 1 e- per nickel atom? The atomic mass of nickel is 58.6934 g/mole and the density of nickel is 8.902 g/cm3. a. 3.32 x 1028 e- ' s /m3 b. 1.56 x 1029 e- ' s /m3 c. 5.64 x 1028 e- ' s /m3 d. 9.13 x 1028 e- ' s /m3 e. 7.63 x 1028 e- ' s /m3
- X- Hall Effect demonstrates that it is the electrons that are free to move. Y- Germanium and Selenium are materials that are intermediate between insulators and conductors. O X is true and Y is false O X is false and Y is true O X and Y are both true O X and Y are both falseb. Each copper ion (Cu++ ) carries two charge carriers (ne) with it. There are 6.02 x 1023 (NA) copper ions in one mole of substance (n). How many charge carriers is in one mole of copper. 24 23 2x 6.c2x 1c 1. 20 To mTWhat is a characteristic that is common to a steel sheet, copper wire. metal paper clip and a wooden spoon does not have? * O all are conductors and allow electrons to flow except for the wooden spoon O all are insulators and allow protons to flow except the wooden spoon O all are insulators and allow electrons to flow except for the wooden spoon O all are conductors and allow protons to flow except for the wooden spoon.
- %ov lI. O 9:17 Useful Constants: Charge of electron 1.6xte"C. Mass of electron= 9.1x"Kg. Permittivity of space=s.K5x10"Fim. Plank's constant = 6.626x10" Awe Boltzmann's constant =1.38x10"SK Speed of light = xto'm/re. Your answer Q1 * Q1: The total energy in third orbit is (-1.53 ev). Find. A- The radius of the orbit B- The velocity of electron in this orbit C– Kinetic energy. D- Work energy. تمت الاجابة وساقوم برفع الملف نهاية الأسئلة Q2 * Q 2: Semiconductor have the energy gab is lev the electrons density at 300k is 100 mand the holes density is 10"m. Find. A- What is the type of semiconductor? B- Carrier charge density C- Donor atoms density D- The position of fermi level تمت الاجابة وساقوم برفع الملف نهاية الأسئلة العربية الإنجليزية IIQuestion 1 a) Ina closed circuit, an electric current of intensity i goes through a resistor of resistance R. The electric potential at the edges of R is measured to be V. If now we write R would this generally bethe definition ofthe resistance quantity R, or the expression of Ohm's Law? Explain. b) We define the resistivity (via the familiar notation) as E p= Thus show that the resistance R can be written as, R =p- here Lis the length ofthe resistor, and A is the cross-sectional area ofit. c) Let J the curent density (i/A). Express J in tems of the electron density n (electrons/m), the electron drift velocity va, and the electron charge e. d) Show that the resistivity can be expressed (via the familiar notation) as, m p= ne't here m is the electronmass; t is the period of time that elapses between two subsequent collisions, the electron undergoes with copper nuclei throughout its chaotic motion in the body of copper (supposing that the current carrying cable is made of copper). Hint:…If the 2 x 2 x 2 nm³ particle is made of Al with a free carrier density of 2 × 10²3 how many free electrons do you have? e cm3⁹
- ny If the bonding energy, in terms of (r), between two ions is (2-1), x and y are constant and n is an integer number. a) Find the repulsive and attractive forces between the two ions. b) If the bonding energy between the two ions at the equilibrium state is given as Find the smallest distance between the two ions to achieve the state of equilibrium. ny. 2) 1-n6. In a regular FCC, determine number of atoms per unit area in (1 1 0) plane 7. In a BCC unit cell, determine number of atoms per unit area in (1 1 1) plane 8. Assuming that each Au atom donates one conduction electron, calculate the drift mobility and drift velocity of the conduction electrons in gold at 20° C if the applied electric field is 200 V/cm. What is the mean free path of the conduction electrons if their mean speed is 1.4 x 10°m s ? Resistivity of pure gold at 0°C (273 K) is po= 22.8 n2 m. a, for Au from Table 2.1 is 1/251 K'. Given that Au is FCC with lattice parameter of 0.407nm. 9. Na is a monovalent metal (BCC) with a lattice parameter of 0.43nm. The drift mobility of clectrons in Na is 53 cm V's'. Calculate the electrical conductivity of Na and the mean scattering time of conduction electrons. 10. Determ ine Miller Indices for the following: A 1/217 Silicon is a substance often used in electronic devices. Silicon has a high electrical resistance compared to metals which means that it does not release its electrons very easily. However, it does conduct electricity when the right conditions are met. These properties allow electronic devices to control the electrical current sent through silicon much easier than a typical metal substance. The properties of silicon would cause it to best be classified as a – A conductor B insulator C semiconductor D superconductor