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- 1. What is the volume of a tank that can hold 18 754 Kg of methanol whose density is 0.788g/cm³? Answer in kg/cm³ Answer in g/cm³ What is the correct significant figures i. ii. iii. 2. Choose if it's carbon, nitrogen or silicon. i. iii. iv. V. Which is the largest ionization energy? Carbon, nitrogen or Silicon? Which is the largest atomic size? Carbon, nitrogen or Silicon? Which is the least electron affinity? Carbon, nitrogen or Silicon? Which is the smallest electronegativity? Carbon, nitrogen or Silicon? Which is the most non-metallic element? Carbon, nitrogen or Silicon?Q3. Consider an n-type silicon photoconductor which is 0.1 cm long, 1µmthick and 50 umwide. If the incident photon flux Do=1016cm-2s-1on its top surface and the absorption coefficient a=5x104cm-1, čalculate the stead photocurrent when a 5 V supply is applied across the longitudinal dimension of the sample. Assume that pn=1200cm2V-s, µp=450cm2V-sand Tn=Tp=2x10-7s2. What is the energy of the electron in the Hy drog en atom aft er absorption an electro- magnet ic wave with frequen cy of 3.284 × 10'5Hz?(Ans. 13.59 eV).
- Q1: Calculate electrons and holes concentration in a germanium sample . If T-300 K, Nd=5×10¹%/m³, N₁-0. Assume that n=2.4×10¹9/m³. (Ans: 5.97×10¹9/m³, 9.65×10¹8/m³)3. For an active medium of length L=10cm and having lasing atoms with cross section area and population inversion o (N2 – N1) = 0.1 cm-!, calculate the outgoing photon flux Fout after 3 passes through the medium as shown in the illustration. Assume the initial photon flux is Fo = le20 s- cm2 and the output flux is the sum of the two transmitted fluxes as shown. F(2) = F(0)exp(o(N2 – N¡)z) If the photons have wavelength A-1.06 µm, what is the output power density in watts/cm2? What is power density if wavelength 2-10.6 µm? R=0.8 R=1.0 L=10 cm F1 F2 Fs Fo FoutI need some help with the following problem. 1a. What is the maximum number of electrons that can be emitted if a potassium surface of work function 2.40 eV absorbs 5.00 x 10-3 J of radiation at a wavelength of 325 nm? b. What is the kinetic energy and velocity of the electrons emitted?
- Q6 For the pure (intrinsic) germanium in the following figure 2 m M. = 0.36 m2 calculate: V. sec . > Hy = 0.17. v.sec. 1) The drift velocity of the electron and the hole. 2) The conductivity of the germanium if the intrinsic carriers concentration equals ( 2.5x10" / m² ). 3) The total current. w= 0.4 cm d=0.15cm L= 2.5 cm 10 v Ans.) 144– ,68- ,2.12(Qm)",0.005A sec. sec.Q. use determine the polari zibilty ekatoms clausius Mossotti equation to in the air molecules, where the number density of day relative oliplacement of nitrogen cur is 2:S04 x135 m?, Assume the result O for nitrogen atom and Compute the nucleus and electronic cloud at 6. tidd strength Em = 3x10 /m13 The surfoce temperature of the oun * is obout 6000 K. Accordingly which wovelenght corresponds to the greatest 15 value of the electro etic. rodiotion from the an? Interpret your reaul 16 occor ding to the sensitiuity ofhe humon. ge. 17 18 19
- The average speed of a hydrogen molecule at 20o C is 1930 m/s. What is the wavelength of the H2 molecule at this temperature?2. What is the energy of the electron in the Hy drog en atom aft er absorption an electro- magnet ic wave with frequen cy of 3.284 x 1015H2? (Ans. 13.59 eV).2. A sample of rubidium gas of volume 1 × 10-8 cm³ is cooled until it forms a Bose-Einstein condensate. At a temperature of 250 nK, half of the rubidium atoms are in the condensate. (a) Calculate the number of rubidium atoms in the sample. (b) Describe the apparatus that can be used to create this Bose-Einstein condensate.