Conductivity Concentration of KCL vs Conductiv 160 140 120 100 80 60 40 20 0.1 0.2 0.3 0.4 0.5 Concentration of KCL
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- Question 1 The graph below shows the electrical conductivity of some elements from the periodic table. Antimony Carbon Ruthenium Copper Silver 0. 20 40 60 80 Electrical conductivity (x10° S/m) 1.1. With the aid of a clearly labelled graph, describe the effect of temperature on the electrical conductivity of copper and antimony. сopper 1.2. Explain the difference in the electrical conductivity of ruthenium and antinomy. 1.3. Adding small quantities of boron may increase the electrical conductivity of antimony. With the aid of a labelled diagram, explain how this is possible. Besides lower electrical conductivity, suggest a reason why ruthenium is not used in electrical transmission wires. Give a detailed response. 1.4.1. Which material is a better conductor of electricity? (a) Metals (b) Ceramics (c) Polymers (d) composite 2. Which material tends to present lower density? (a) Metals (b) Ceramics (c) Polymers (d) composite 3. Electron sea exists in (a) Hydrogen bond (b) lonic bond (c) Covalent bond (d) Metallic bond 4. Burger's vector changes with (a) Kind of dislocation (b) Length of dislocation (c) Both kind and length of dislocation (d) None 5. Metals are malleable and ductile because (a) Metals can be shine (b) Metals produce sound (c) Layers of metal atoms can slip over each other (d) Opaque. 6. Effective number of atoms in a face centered cubic (FCC) unit cell is equal to (a) 4 (b) 1 (c) 8 (d) 2 7. Lead is a metallic crystal having a structure. (a) FCC (b) ВСС (c) HCP (d) Sc 8. Amorphous solids have structure. (a) Regular (b) Linear (c) Irregular (d) Crystal 9. Percentage of free space in a body center cubic (BCC) unit cell is. (a) 30 (b) 32 (c) 28 (d) 20 10. Fiberglass is an example of (a)…(2) or ane-dimensional h 530K MaterialI Material II d= k iscuss the analogie quations. What is the 310K Give three 3) 0.Sm Determine 4) Swo-hour period & and the conductivity of I is 52 W m' K'. 5) At steadu (3) Describe the N-type interaction and the U-process collisions in solids. of 大"我 Determine tE conductivity At steady state, the in a thus:
- A /-in. mineral ceiling tile has absorption coeffi- cients as follows: 125 250 500 0.31 0.29 0.51 0.7 1000 2000 4000 8000 0.71 0.71 0.58 What is the NRC for the material?Q2/ semiconductor at T, has conductivity of 2.5 x 106 s/m. number of electrons of 3x 103 Numbers of holes 3x 103 ,charge of 1.602 x 10 -19 c, and at T2 has conductivity of 3.6 x 10 s/m , number of electrons of 4.5x 1014 , Numbers of holes 2x 102 ,charge of 1.602 x 10-19 c. Calculate the mobility of electrons and holes1. The following questions concern two hypothetical materials, R for the red curve and B for the blue curve, (see figure below) showing the net interatomic forces as a function of interatomic separation. (6") a) Which material will have a higher modulus of elasticity, and why? b) Which material will have a higher melting point, and why? c) Which material will have a larger coefficient of thermal expansion, and why? Hint: You can integrate graphically. ro Separation Force
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