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- 1.the electrons which are initially at rest are accelerated through a potential difference of 125V.calculate the de Broglie wavelength. 2.two long parallel wires carrying currents i1 and i2 in opposite directions. what are the magnitude and direction of the net magnetic field at point P ? ASSUME THE FOLLOWING VALUES i1=15A,i2=32A, and d=5.3cm.4. A laser with a power of 1.0 mW has a beam radius of 1.0 mm. What is the peak value of the electric field in that beam?a. 490 V/mb. 840 V/mc. 65 V/md. 120 V/me. 22 V/mDetermine the energy of a 891 nm photon in eV. Express your answer in three decimal places.
- 4. What is the maximum acceleration potential (V) must be applied to electrons to cause electron diffraction on (220) planes of Lithium at 0 = 5°? (aLi = 3.517A°, m. = 9.1093837015 × 10' kg, q. = 1.6 × 10-19 coulomb, h = 6.62 x 10 34 J.S).2. Write the formula for Femi-Dirac distribution function:4. Briefly explain the motion of carriers in semiconductor materials (i) when there is no electricfield, (ii) when there is electric field, and (iii) when there is illumination.5. Briefly explain how the absorption coefficient and absorption depth change as a function ofwavelength in semiconductor materials. Briefly explain why the absorption coefficient increaseswith increasing photon energy for energies near the bandgap.
- When a 546 nm light is used in a photoelectric experiment, the stoppingpotential is 0.38 V.i. Calculate the work function of the metal. ii. Calculate the minimum de Broglie wavelength of the electron.iii Will electron be emitted if the target material is replaced with silverwork function 4.73 eV? Justify your answer.2. What is the magnetic dipole moment of a sphere of uniform surface charge density o, which rotates with constant angular velocity o about an axis of the sphere? An electron has a permanent magnetic dipole moment of magnitude: eħ (Bohr magneton). 2mc u = Suppose the electron is a rotating spherical shell of charge with "classical electron radius": e? mc What is the velocity at the equator? Can classical electrodynamics explain the origin of the electron magnetic moment?c) If the position of an electron in an atom is measured to an accuracy of 0.0100 nm, i. Calculate the electron's uncertainty in velocity. ii. If the electron has this velocity, determine its kinetic energy in eV.
- b. | Compare the average positions of the electron for H and He*.1. Compare the λmax (ex) with λmax (em). If there is a ΔE between the ground state and the excited state, why is the excitation λmax different than the fluorescence emission λmax. What is this displacement called? 2. Explain why it is more convenient to quantify by selecting the maximum absorption / emission wavelengths?2. What is the function of FOH device? 3.Obtain discrete domain transfer functions and pole zero maps of the following s - domain functions using (a) ZOH method (b) FOH method (c) Tustin method 1. G(S) = 5²+5+4 2. G(s) = 5 s²+9 3. G(s) = 1 (s2+3s+5)(s+3)(s+5)