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A metal crystallizes into two cubic phases BCC and FCC. The ratio of densities of FCC and BCC is equal to 1.5. Calculate the difference between the unit cell lengths of the FCC and BCC crystals if the edge length of the FCC crystal is equal to 4.0 Å.
For a cubic metal with lattice parameter of 3.92°A, the first four diffraction peaks from the X-ray powder diffraction pattern taken with Cu-Ka radiation (λ = 1.5405°A) occur at 2θ values of 39.7, 46.2, 67.5 and 81.3 degrees. The crystal structure of the metal is
The interplanar spacing of (220) planes of a FCC structure is 1.7458 Å. Calculate the lattice constant.
Minimum interplanar spacing required for Bragg’s diffraction is:
A spacing ‘’D’’ can be used to completely accommodate the lattice misfit in the one direction without any long-range strain field by a set of edge location. Calculate the value of D if the interplanar spacing’s of matching planes are given as 20mm, 19mm respectively? (Assume the misfit to be very small)
All the forms of matter except gases emit electromagnetic radiation continuously. The gases which electrically or thermally excited emit a certain wavelength only, then which of the following is/are true about the process (i) The spacing between the atoms in the other forms of matter is high than in gas (ii) The spacing between the atoms in gases is high than the other forms of matter (iii) The energy of the emitted radiation depends on the spacing between the atoms (iv) The wavelength of the emitted radiation depends on the spacing between the atoms 
Tata salt was tested (FCC) with X-ray (0.071nm) which is diffracted by (110) plane with lattice constant of 0.28nm. Find the diffraction angle for 2nd order diffraction.
Consider X-ray diffraction from a crystal with a face centred cubic (fcc) lattice. The lattice plane for which there is no diffraction peak is
. A, B, C, D, E and F compared their marks in an examination and found that A obtained the highest marks, B obtained more marks than D, C obtained more than at least two others and £ had not obtained the lowest marks. Consider the following statements : Statement 1: At least two members obtained less marks than C Statement 2: E and F obtained the same marks Which of the above statement(s) is/are sufficient to identify the one with the , lowest marks ?
The lowest angle reflection in a powder diffraction experiment or an fcc metal using Cu-Ka radiation (y = 1.54°A) occured at an angle of 19°30'. The lattice parameter of the metal is . . . . . . . . °A.