SUMMARY FROM LAST CLASS
Doped semiconductor
N-type doping corresponds to introduction of donor impurities from Group V which donate negatively charged mobile carriers (electrons) and generate donor states below the conduction band. P-type doping
MSE 110 Problem Set 6
Problem 1
Using the molar mass and density from your periodic table, calculate how many atoms there are in 1 m3 of sodium? [Answer in number] Ans: The density of sodium is 0.97 g/cm3 and the molar mass is 22.98 g/mol therefore t
*Primary Bonding: Corresponf to ionic, covalent and metallic bonds. Strong (100-1000 kJ/mole) *Secondary bonding (Van der walls) weak forces due to dipole interactions. (.110kJ/mole) *Secondary bonds important: form ice, was, sulfur. Bonding is coval
MSE 110 Problem Set 5
Problem 1
What is the average number of valence electrons per atom on the following compound: CdAg2Ge4Ga2Se4P2? [Answer in number] Ans: Cd provides 2 electrons, Ag 1, Ge 4, Ga 3, Se 6 and P 5. The total number of electrons is th
MSE 110 Problem Set 1
Problem 1 Photons emitted by a red He-Ne laser have energy E=3.14510-19 Joules. What is the wavelength of these photons? (5 pts) [Answer in nm] Ans:
E = h = h c
where E=3.14510-19 J, c = 3 108 m/sec, and h = 6.62610-34 Jsec
MSE 110 Problem Set 4
Problem 1
Carbon monoxide CO is a toxic molecule release in car exhaust. Build its MO diagram and find its bond order. (7pts) [Answer in number] Ans: The C atom provides 6 electrons and the O atom provides 8 electrons for a tota
There are three types of band structures associated with each types of primary bonding which determine the properties of electrical conductivity of solid materials. Metals are conductors and have either a partially filled s, p, or d band or
MSE 110 Problem Set 2,
Problem 1
An electron of wavelength = 0.333 nm forms a standing wave on an orbit of radius r = 0.159. What is the level n of that orbit? (8pts) [Answer in integer] Ans:
From n = 2r we obtain n = 2r = 2 0.159 = 3 0.333 The
SUMMARY FROM LAST CLASS Van der Waals Bonding
Primary bonding: Ionic, covalent, metallic : 100-1000kJ/mole. Secondary bonding: or van der Waals bonding : 0.1-10 kJ/mole. Van der Waals bonds are weak electrostatic forces involving dipole that binds
SUMMARY FROM LAST CLASS Conductivity
n is the number of charge carriers (electrons) per unit volume (m-3). e is the charge of the electron (1.6x10-19 C). is the mobility of the electron. Metals have high n but low , semiconductors have high
MSE 110 Problem Set 3,
Problem 1
Which of the following atom has the largest number of unpaired electron in its ground state configuration? (8 pts) [answer A, B, C, D, E] A C B Ta C As D Fe E Co Ans:. Following Hund's rule, C has 2 unpaired electrons
MSE 110 Problem Set 1,
Problem 1 Photons emitted by a red He-Ne laser have energy E=3.14510-19 Joules. What is the wavelength of these photons? (5 pts) [Answer in nm] Ans:
E = h = h c
where E=3.14510-19 J, c = 3 108 m/sec, and h = 6.62610-34 Jse