1. Refer to the Table below that lists the first few spherical harmonics YM. Suppose we subject a linear rigid molecule to z-polarized microwave radiation. Show explicitly that the Y→ Yº rotational transition is allowed while the Y→ Y₂ transition is not allowed. TABLE 6.3 The first few spherical harmonics. YOU 1 (4x)¹/2 3 Y₂¹ Y₂² 1/2 Y = 87 1/2 x² = (15) (3 cos²0-1) 1/2 = sin Be 15 87 15 327 sin cos le-¹ 1/2 sin²Ge-24 Y₁ = Y₁¹ = 3 87 15 87 Y₂ = Y² = (3 15 1/2 32π cos 9 1/2 1/2 sin gel sin cos e 1/2 sin² 0e²
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- In a H-atom series, the shortest wavelength transition is registered at 821 nm. plsease explain the step by step (1) Identify the transition. (2) Calculate the energy of the above transition in J and eV. (3) What is this series? (4) Calculate the longest wavelength in the series?L. An electron is confined in a cubical box of side 1Å. (i) Find its lowest energy (ii) what is the temperature at which the average ofthe molecule.ofa perfect gas would be equal to the lowest energy of the clectron (k =1.38×10-23 JI/K)?Consider the radial wave function for a hydrogenic system: n = 7 50 100 150 200 r a. What is the angular momentum letter of the orbital? b. What is the numerical value of the magnitude of the orbital angular momentum? For h use the value 1.0545718 × 10-34 Js. Js c. What are the possible values of the quantum number for the z-component of the orbital angular momentum? Enter as a comma separated list from least to greatest (e.g. ...,-1,0,1,2,... ): d. Is there a difference in the electron's energy if it were in an 4p orbital instead of the orbital it is actually in as indicated by the above wave function? yes no N psi(x) -0.1 0.1 0.2 0.3
- Q1. Dispersion relation of electron in 1 D solid is E(k)= E-a-2ß cos(ka). Determine (a) density of states. (b) the effective mass of electrons at k = 0 as well as Brillouin zone boundaries. (c) the point of inflection i.e. k - value where velocity is maximum. Also determine the maximum velocity. (d) the band width.1. An atom has two atomic levels separated by an energy gap of the 2.26 eV. What is the temperature should make the population inversion N/N, equal to half? When T= 37824.7 K 2. The length of the optical cavity in He-Ne laser of a wavelength of 632.8 nm is 55 (cm]. Find the approximate number of longitudinal laser modes. m= 1.7x 10 3. A Ruby laser contains a crystal length (4cm) with a refractive index of (1.78). The peak emission wavelength from the device is (0.55µm). Determine the number of longitudinal modes and the bandwidth of the net gain. m=145454 Au= 3x1014 Hz 4. Resonator for laser consisting of two concave mirrors, Nd: YAG and quality factor M=1 Calculate: - The TEM00 at the center and on the mirrors (wo,w1,w2). The diffraction angle of the laser beam (@aiv). NYAG fdemWhich of the (110) type directions lie in the (112) plane? OA. [110] and [110] OB. [101] and [101] OC. [011] and and [101] OD.[110] and [110] OE. [110] and [101] QUESTION 30 The lattice constant of the unit cell of a-iron (has a bcc structure) is 0.287 nm. The number of atoms/mm2 (atoms per unit area) for the (111) plane is: OA. 9.86 X 10° atoms/mm² OB. 48.56 X 10° atoms/mm² OC. 0.96 X 10¹3 atoms/mm² OD. 22.11 X 10¹3 atoms/mm² 2 po
- 2. What are all of the Maxwell relations for the differential expression of Gibbs Free energy of dG s-SdT + Vdp +udn, ?Determine all the allowed electron transitions for the hydrogen atom involving only the lowest 5 energy levels. [Ignore electron spin.] a. Explicitly note the number of possible transitions. [For parts b and c, the atom is in an external magnetic field of 2.2T. Find numerical values.] b. C. Determine AE for the transition with the lowest energy change. Determine AE for the transition with the highest energy change.We want to look at the angular momentum structure of one electronic level of an atom. a. The atom has orbital angular momentum L, electron spin angular momentum S and nuclear angular momentum I. For very large magnetic fields B, what are the quantum numbers and energies? b. In addition to the static B field along the z axis, we add a transverse oscillating magnetic field. Which states are now coupled by the oscillating field, i.e. between which states are transitions induced?
- 4. Liner ionic crystal. Consider a line of 2N ions of alternating charge ±q with a repulsive potential energy A/R" between nearest neighbors. (a) Show that at the equilibrium separation (CGS) (b) Let the crystal be compressed so that R. → R. (1-8). Show that the work done in a compressing a unit length of the crystal has the leading term C8²/2, where 2 (n-1)q² In 2 (CGS) C = U(R): = 2Nq² In 2 (₁-1). Ro n Ro To obtain the results in SI, replace q² by q²/4л. Note: We should not expect to obtain this result from the expression for U(R), but we must use the complete expression for U(R).Physics 1. Derive the expression ε(ω)=1- ωp 2 / ω2 , ωp2 =ne2 /ε0m for the dielectric constant as a function of ω for a free electron gas of number density n. 2. Show clearly that metals are opaque to light for which ω is less than ωp. 3. Calculate the wavelength cutoff for Na metal if the volume of a primitive unit cell in Na is 35×10-30 m3 how to solve this problem?*42. a. Determine VL, IL, Iz, and Ir for the network of Fig. 2.186 if R1 = 180 N. b. Repeat part (a) if R1 = 470 N. c. Determine the value of R1 that will establish maximum power conditions for the Zener diode. d. Determine the minimum value of R1 to ensure that the Zener diode is in the “on" state. Rs 220 2 IR Vz = 10 V RL VL 20 V Pz, = 400 mW Zmax FIG. 2.186 Problem 42.