A spectral line of 48Ti8+ in a distant star was found to be shifted from 654.2 nm to 706.5 nm and to be broadened to 61.8 pm. What are the speed of recession and the surface temperature of the star?
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A spectral line of 48Ti8+ in a distant star was found to be shifted from 654.2 nm to 706.5 nm and to be broadened to 61.8 pm. What are the speed of recession and the surface temperature of the star?
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- 3. (a) Calculate the number of core and surface atoms for a 40 nm spherical FCC Cu particle. Find out the surface coverage of atoms. Calculate surface area to volume ratio of the particle. (Given, radii of Cu=0.128 nm); Diameter Shell 49d 99d 125d 156d XXL number 25 50 60 80 dinl(1)Calculate the average distance a 100 keV photon will travel in graphite. (2) Calculate the thickness required to halve the intensity of the incident beam.(V) Consider solid and liquid samples of equal mass and heat capacity. If microwaves are fired at both samples, which one will increase in temperature faster? (VI) Using the Heisenberg uncertainty principle, calculate the frequency spread Av for a nanosec- ond (10-9 s) pulse from a CO2 laser, in which the nominal photon energy is hv = 0.112 eV.
- (c) Estimate the wavelength of electrons that have been accelerated from rest through a potential difference of 75 kV.Calculate the energy separations in joules, kilojoules per mole, and electronvolts, and as a wavenumber, between the levels (a) n = 3 and n = 1, (b) n = 7 and n = 6 of an electron in a one-dimensional nanoparticle modelled by a box of length 1.5 nm.A nitrogen molecule is confined in a cubic box of volume 1.00 m3. (i) Assuming that the molecule has an energy equal to 3/2kT at T = 300 K, what is the value of n = (nx2 + ny2 + nz2)1/2 for this molecule? (ii) What is the energy separation between the levels n and n + 1? (iii) What is the de Broglie wavelength of the molecule?
- (c) The kinetic energy, KE, of electrons emitted from a metal surface after irradiation with UV light of wavelength A is given by: hc Kε = 7-9 where h is Planck's constant (6.626 x 10-4 Js), c is the speed of light in a vacuum (2.99 x 108 m s¹), and is the work function of the metal surface. In a specific experiment, light with a wavelength of 266 nm was used to irradiate a cadmium (Cd) metal surface. Calculate the photon energy of the light used in the experiment, in Joules. (1) ₂4(a) Derive linear density expressions for BCC [110] and [111] directions in terms of the atomic radius R and (b) compute linear density values for these same two directions for tungsten. (a) [110]: i [111]: i (b) [110]: i [111]: i atom/R atom/R 1/m 1/mNeutrons, like electrons and photons, are particle-waves whose diffraction patterns can be used to determine the structures of molecules. Calculate the kinetic energy (in J) of a neutron with wavelength 51.1 pm.
- It is considered that a solid substance has an orthorhombic structure. Since the edges of the unit cell are a = 3.50Å, b = 4.0 Å, c = 5.5 Å, calculate the d and 2θ positions for the 111 plane expected in the diffraction pattern as a result of CuKα radiation (λ = 1.54 Å).a) List all the particle-hole excitations across the Z=N=20 and Z=N=28 shell gaps that could give rise to 3- states in Calcium-40 and Nickel-56, respectively. b) Considering the number of ways that you can make 3- states, which of Calcium-40 or Nickel-56, will have the lower-lying octopole vibration?What are differences between n→π* and π →π* bonding electron transition in Fluorescence? Please answer shorty at your own words. Answer should be to the point.