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- how do you know if the material is a conductor/insulator?39. Some incandescent light bulbs are filled with argon gas. What is vrms for argon atoms near the filament, assuming their temperature is 2500 K?Electronics Physics -HW2 QI. In a P-type germanium, ni = 2×10" electrons/m and the density of boron 4x1023 atoms/m'. The electrons and holes mobility are (0.4 and 0.2 m/ V. s) respectively. What is its conductivity before and after addition of boron atoms? Note: For after addition of boron atoms you need to compare the actual and approximate conductivity ملاحظة: بعد اضافة ذرات البورون يكون حساب التوصيليه بالاستخدام التقريب وبدون استخدام التقريب والمقارنة بين النتائج
- For the temperature field T(x.y) = 43y 3x²+3y2 ' identify an isotherm from the following: Select one: O a. x?+y? = 1 b. None of these. O (x-1)2+y? = 1D O d. x2 +(y-1)2 = 17. Calculate the mass of nitrogen present in a volume of 3000 cm' if the gas is at 22.0 °C and the absolute pressure of 2.03 ×10* Pa is a partial vacuum easily obtained in laboratories. (a) 6.95 ×10 kg; (b) 6.95 ×10* kg; (c) 6.95 ×1012 kg; (d) 6.95 ×10-16 kg. 8. Materials in which the electrons are bound very tightly to the nuclei and do not move freely are referred to as (a) Insulators; (b) Conductors; (c) Semiconductors .Question 1 (a) State Coulomb's Law. What is unit of electric charge? (b) When a 390 g piece of iron at 200°C is placed in a 85 g copper calorimeter cup containing 230 g of glycerine at 15°C, the final temperature is observed to be 40°C. Estimate the specific heat of glycerine.( specific heat of iron 450 J/kg°C, Specific heat of copper 385 J/kg°C)
- Why is it that only electrons near EF contribute to the electrical and thermal conductivity? Explain briefly in your own words.4. Compute the linear attenuation coefficient of iron oxide (Fe304) at 1 MeV. Use the figures provided and the following information; µc = (Opp x Z?), PPi = g/mole, AFe NeocZ, µpe = Nope (Ope X 2"), Mрp — Nopр 11.3 g/cm³, pre304 = 5.8 g/cm³, Zp = 82, ZFe = 26, Zo = 8, Ap6 = 207.19 = 55.85 g/mole, Ao = 16 g/mole. (Note: µFe304 = µFe+ µ0).Cylindrical-conductors has inner and outer radii of 15 mm and 50 mm, respectively. If V(p = 15 mm) = 0 V and V(p = 50 mm) = 200 V, &r = 10 %3D %3D %D calculate : a. V, E, and D at p = 20 mm b. Ps on each plate.
- 1. An expensive vacuum system can achieve a pressure as low as 1 x 10-7N/m² at 20 °C. How many atoms are there in a cubic centimeter at this pressure and temperature? The Boltzman's constant k= 1.38 x 10 m²kg/(s²K) -23 Number of atoms:Task 3: calculatepfif tires expand by 10% UseT; = 20°C Tf-50°C Pi = 200kPa Vf = V₁ + V₂. Vf Vi = V₂.1.1 Vi Pi Vi = nmoles RT; PƒVƒ = nmoles RTf V₁ = Vf Pi Vi Pf Vf 10 100 = nmoles RT; nmoles RTf = V₂ (1 + 0.1) = V₂.1.1 .afcopper whe (aae.0068) is conneeteed to a 12 volt batt ery at z08 aned contaret cuttent ef aýs A at pew temperatute the same wive contacts a cuYtent ofO.41A (A)is the new bempera ture. than 20°C (3) what the new tepmperature. highel ex Lower