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- (a) What voltage must be applied to an X-ray tube to obtain 0.0100-fm-wavelength X-rays for use in exploring the details of nuclei? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?What is the identity of this metal X where the lowest energy for the fluorescence ray emitted is 35427.88 eV? And what longest expected X-ray wavelengths for the fluorescence ray?What is the wavelength, in nm, of a 1.73-ev photon? Normal format with 4 SF. Hint: 1 eV=1.60x 10-19 J.
- 1) Determine the absorption coefficient u (7.2 keV) for Fe metal? Pre= 7.86 g/cm? O re (7.2kev) =393 cm²/gA. If the position of a chlorine ion in a membrane is measured to an accuracy of 1.50 µm, what is its minimum uncertainty in velocity (in m/s), given its mass is 5.86 10-26 kg? B. If the ion has this velocity, what is its kinetic energy in eV? (Compare this with typical molecular binding energies of about 5 eV.)The flux of solar energy reaching the Earth's surface is approximately 7 J/cm?. Assume that all of this energy is used by a green leaf (10 cmř in area), with the maximal efficiency of 35%. How many moles of hexose could the leaf theoretically generate in an hour? Use 600 nm for an average wavelength.
- ➤Calculate the four largest wavelengths for the Brackett and Pfund series for hydrogen. Hint: Brackett (n = 4), Pfund (n = 5) mimo.com po MThe number of silicon atoms per m3 is 5 × 1028. This is doped simultaneously with 5 × 1022 atoms per m3 of Arsenic and 5 × 1020 per m3 atoms of Indium. Calculate the number of electrons and holes. Given that ni = 1.5 × 1016 m-3. Is the material n-type or p-type?Determine the element with the lowest atomic number that can be detected by wavelength dispersive x-ray spectroscopy that uses the LiF (200) crystal with the d spacing of 0.4028 nm.
- It has a high atomic number to improve the efficiency of bremsstrahlung x-ray production .A Tungsten is required .B copper rod .c Thermionic emission .D All choices are not correct13 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 18 193. 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 Fout