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- 2. Consider two types of impurities for Si: boron and phosphorus. Which impurity is a donor and which is an acceptor?43. Which of the following statements is correct? Select one: A. The covalent index X2mr is the ability of the metal to donate electrons to an electron acceptor. B. The toxicity of metals increases in the order Borderline < Type A < Type B metals C. The covalent index X2mr cannot be used to differentiate between type A, type B and borderline metal D. The values of ionic index are smallest for type A metals and largest for type B metals. E. The values of covalent index are smallest for type A metal and largest for type B metals.QUESTION 3 The solid phase of an element follows van-der Waals bonding with inter-atomic potential:
- Zener breakdown occurs in a p-n junction having p and n both: a. lightly doped and have wide depletion layer. b. heavily doped and have narrow depletion layer. c. heavily doped and have wide depletion layer. d. lightly doped and have narrow depletion layer.2A. Calculate Z and V for sulfur hexafluoride at 75 °C and 15 bar by the following equations: a) Truncated virial eqn. 3.39 w/ B = -194 cm³/mol & C = 15,300 cm/mol² b) Redlich/Kwong eqn. c) The Soave/Redlich/Kwong equation d) The Peng/Robinson equation For sulfur hexafluoride, Tc= 318.7 K, Pc=37.6 bar, Vc= 198 cm³/mol and o = 0.286. ww www3. What is the bond length of Na-Cl? Given that the atom co-ordinates are Cl(0,0,0) and Na(1/2,1/2,1/2) and lattice parameter a = 0.563 nm.
- How many unpaired electrons are present in the isolated carbon atom ( atomic number = 6)' A. none B. one C. two D. three E. four(e) Using the characteristic function, show that a(N) (N²). = k„T (f) Show that fluctuations in the number of adsorbed particles satisfy (N*), (N)? 1-f Nf1A. Explain why vibrational excitation of molecules by electron impact mostly proceeds through intermediate electron attachment and not by simple elastic collision.