Calculate the degree of population inversion required to give a gain coefficient of 0.5m1 for a CO, laser which has a wavelength of 10.6um. The transition rate for spontaneous emission, A,„, is 200s-l. The refractive index is ~1 for CO, ul> c2 8πη2ν2Αul and ΔΝ Ξ Barytyi Aut – du N gi
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- True or false? (a) The photon emitted in an n = 3 to n = 2 transition in the H atom has a lowerfrequency than the photon for an n = 2 to n = 1 H-atom transition. (b) The groundstate energy ofHe is about 4 times the ground-state energy of H. (c) yis zero at the nucleus for all H-atomstationary states. (d) For the ground state of the H atom, y2 is a maximum at the nucleus. (e) Themost probable value of the electron–nucleus distance in a ground-state H atom is zero. ( f ) Thesmallest allowed value of the atomic quantum number n is 0. (g) For H atom stationary stateswith l = 0, yis independent of qand f. (h) For the H-atom ground state, the electron is confinedto move on the surface of a sphere centered around the nucleus. (i) For the H-atom ground state, the electron is confined to move within a sphere of fixed radius.A hydrogen isotope separator contains positively ionized hydrogen H^1, with isotope of hydrogen, Deuterium D^2, and other heavy particles, and the ions were released in a potential difference of 200 Volts. The strong magnetic field of 1.4x10^-2 Tesla (out of the page), bends the ions and Deuterium is collected on separate ionic trap as shown in the figure. (Masses MH1=1.67x10^-27 kg, MD2 = 2* MH1, Q(H1, D2) = 1.6x10^-19 C) What are the velocities of the Deuterium when exiting the plates, in unit of 10^5 m/s?A hydrogen isotope separator contains positively ionized hydrogen H^1, with isotope of hydrogen, Deuterium D^2, and other heavy particles, and the ions were released in a potential difference of 200 Volts. The strong magnetic field of 1.4x10^-2 Tesla (out of the page), bends the ions and Deuterium is collected on separate ionic trap as shown in the figure. (Masses MH1=1.67x10^-27 kg, MD2 = 2* MH1, Q(H1, D2) = 1.6x10^-19 C. What is the potential energy of plates having the voltage difference of 200 Volts acting on Deuterium in unit of 10^-17 Joules?
- (c) Explain the phenomenon of stimulated emission in LASER.The internal quantum efficiency is 0.65 for a 500μm long InP cavity laser having a reflectivity of 0.29 on both ends. Compute the slope quantum efficiency if the effective absorption coefficient is 10 cm-1 .SSILLIgns iu1 How many 3d electrons does Ti2+ cation have in the GROUND STATE? O 1 О 10 the hot
- Q2 A slab of diefectric materials haş electri susceptrbility Xe=15 the electric freld intensity '(inside the dielectri)-is: E=150 X ax + 2y ay Vt Fiind (tuside the dietectric): Jant ) dielectvic constant, ii) Po at P(3+1,4) (the pointisinside the dieleetrie ¥) tvasapThe maximum characteristic x-ray photon energy comes from the capture of a free electron into a K shell vacancy.What is this photon energy in keV for tungsten, assuming the free electron has no initial kinetic energy?