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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
- 7. 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 .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 = 1Question 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)
- 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).Why is it that only electrons near EF contribute to the electrical and thermal conductivity? Explain briefly in your own words.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: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 LowerTask 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 .
