Which of the following is true about Bragg planes? a. There is ...

[nmorano1]

Which of the following is true about Bragg planes?
  a. There is only one Bragg plane for any given crystal structure.
  b. They are especially useful for detecting transitions between energy levels in the crystals' atoms.
  c. They are used to scatter alpha particles in gold and other materials.
  d. They are evenly spaced planes within crystal structures of atoms.
  e. All of the above.

Question 2

Characteristic x-ray spectra come from
 

A. bremsstrahlung processes for electrons close to the nucleus.
  B. electrons transitioning down from an outer shell replace electrons ejected from an inner shell.
  C. random excitations of electrons when atoms are near room temperature.
  D. photons scattering off of electrons, thereby losing energy and emitting radiation.

[TINA]

Answer to Question 1

d.
Bragg planes must be evenly spaced to create the interference pattern characteristic of the planes.

Answer to Question 2

B.
Characteristic x rays are emitted when a highly bound electron is ejected from an inner (K, L) shell and an electron from an outer shell drops down to replace it. The difference in binding energies produces a photon, usually of high energy like an x ray.

[nmorano1]

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[TINA]

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