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Calculate the threshold frequency of Gold with 7.8x10^-19 J Work Function.
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- Grüneisen parameter for silicon The silicon crystal (diamond structure) has the following properties at 500 K. The lattice parameter (a) = 0.5440 nm, thermal expansion coefficient (a) = 3.6x106 K-', and the bulk modulus is about the same as that at room temperature (K = 99 GPa). The Debye temperature of Si is 625 K. At room temperature (300 K) its density is 2.33 g cm³, and its lattice constant is 0.5430 nm. Calculate the Grüneisen parameter at 500 K and compare with its value at room temperature in Table 1. Is 3 constant?What are the maximum values of the room temperature values (300 K) of the diffusion coefficients for electrons and holes in silicon based on the mobilities as shown ?Silicon has a conductivity of 5×10-4 (Q.m)-1 when pure. How many arsenic atoms/m3 are required so that the conductivity of 200 (Q .m)-1. The mobility of electrons is O.13 (m2/V. Sec), mobility of holes is 0.05(m2/V.Sec) O 2.4038*10^16 /m-3 O 9.6153*10^21/m-3 O 4*10^5 /m-3 O 9.4089*10^5 /m-3 O other:
- Show that for an ideal gas _ c p = _ c v + Ru.Presents the diagram of the problem, necessary formulas, clearance and numerical solution: A poorly designed electronic device has two screws attached to different parts of the device that almost touch each other inside. steel bolts and brass are at different electrical potentials and if they touch, a short circuit will develop will damage the device. The initial separation between the ends of the screws is 5 μm to 27 ◦C. At what temperature will the screws touch? Assume that the distance between the walls of the device is not affected by temperature change and the coefficient coefficients of linear expansion αlaton = 19x10−6 ◦C −1 and αsteel = 11x10−6 ◦C −1The air is a gas mixture of oxygen, carbon dioxide, and Nitrogen. If the air can be treated as ideal gas at temperature 100 °C, what is the average kinetic energy for each of the molecule in air?(Consider Oxygen, Nitrogen, and carbon dioxide as diatomic molecule structure which consist of translational and rotational degree of freedom only. No vibration motion is considered) Boltzmann constant is kg 1. 38 x 10-231/K
- Question 1: The electrical conductivity of sapphire along a particular axis is 1.25 (2m)1 at 1500°C. At the same temperature, the oxygen tracer diffusion coefficient was 0.4 nm's1. From this data, do you believe that oxygen ion movement is the dominant charge transport mechanism. =6.022 1023 atom/mole =9.11 10:31 kg =1.381 10-23 J/K =6.626 10-34 Js mo NA kB h e =1.602 10-19 C 1eV =1.602 10-19 JA rigid tank of volume V = 0.02 m3 contains carbon monoxide at a temperature of T0 = 25° C and a pressure of P0 = 9.00 × 105 Pa. This molecule should be treated as a diatomic ideal gas with active vibrational modes. a)The temperature of the gas increases by 10° C. Calculate the pressure of the gas in pascal at this increased temperature. b)Calculate the change to the internal energy of the gas in joules. c)Calculate the change in the entropy of the gas in joules per kelvin.Compute the average kinetic energy of a gas molecule at 27C. Express results in electron volts. If the gas ishydrogen, what is the order of magnitude of the velocity of the molecules at 27C.
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