Question-12 An X-ray diffractometer recorder chart for an element that has a cubic crystal structure showed diffraction peaks at the following 20 angles: 40.663°, 47.314°, 69.144°, and 83.448°. Wavelength of the incoming radiation was 0.15405 nm. (a) Determine the crystal structure of the element. (b) Determine the lattice constant of the element. (c) Identify the element1
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A: Given that: λ=540 nC= 540×10-9 C/mRadius , R=75 cm= 0.75 mzo=2.99 m
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- Photon and Light Intensity Exercise (1) A laser emits 2.68 x 106 photons per second in a thin circular beam with diameter 1.0 mm. The wavelength of the photons is 532 nm. (a) What color will the laser beam appear to be to the average person? (answer: greenish) (b) What is the laser output power? (answer: 10 mW) (c) What is the intensity of the beam in W/m2? (answer: 1.3 x 104 W/m?) (b) What is the intensity of the beam on a person's retina if the lens of the eye focuses the beam to a circular spot with a 0.1 mm diameter onto the retina? (answer: 1.3 x 106 W/m2)Question 14 a) A narrow beam of white light is passed through a clear glass vessel containing cool hydrogen gas at a low pressure. A prism is used to disperse the light leaving the vessel. This results in a white light spectrum, crossed by a series of dark lines. Explain the origin of these dark lines and name the type of spectrum that is produced. b) Some of the atomic energy levels of hydrogen are shown in the diagram below. i. ii. iii. Energy/eV 0 -0.85 -1.51 -3.39 -13.58 n = 4 n = 3 n = 2 n = 1 Determine the ionization energy of hydrogen and express this in joules. Determine the wavelength of the light emitted when an electron falls from the n = 3 level to the n = 1 energy level. A photon of energy 10.19 eV is in collision with a hydrogen atom. What would happen to this photon?2) A thin crystal of the metal oxide with a tetragonal crystal structure and lattice parameters a = 4.05 Å and c = 2.517 Å is tilted so that a 200 kV electron beam travels along the [001] zone axis. Create a schematic diagram of zero order Laue zone (ZOLZ) diffraction pattern for a crystals of thickness: a) 75 Å b) 400 Å You should assume there are no forbidden reflections and that the diffraction intensity drops to zero when the excitation error, s, exceeds the first minimum of the relrod. You should show the approximate number of beams in the ZOLZ circle. (10)
- Electrons are emitted when a metal is illuminated by light with a wavelength less than 383 nm. Part A What is the metal's work function? ΜΕ ΑΣΦ E = Submit Request Answer Provide Feedback ? eV2. When light with a wavelength of 218 nm is incident on a certain metal surface, electrons are ejected with a maximum kinetic energy of 3.28 x 10 J. Determine the wavelength of light that should be used to quadruple the maximum kinetic -19 energy of the electrons ejected from this surface. X 173.7 nmQuestion 10 c) please
- In relation to x-ray imaging, which of the following statements is true? Choose one answer. a. The linear attenuation coefficient of a material is directly proportional to its half value thickness. b. For clinically useful x-rays, lead has a greater half value thickness than soft tissue. c. The intensity of an x-ray beam decreases exponentially as it passes through tissue. d. The intensity of an x-ray beam increases exponentially as it passes through tissue. e. Good contrast media are generally poor absorbers of X-rays. and Why??Wave Interference 22. A 2-slit experiment involves electrons that are accelerated with bias equal to 1,050 V, with a slit separation of 2 nm and slit-screen separation of 15 cm. (a) Calculate the kinetic energy of the electrons in units of eV. (b) Calculate the velocity of the electrons in m/s. (c) Calculate the wavelength of the electrons in nm. (d) Calculate the distance between the fringes in cm.