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12 Cards in this Set

  • Front
  • Back
1. Align in ascending order the following components of the
electromagnetic spectrum according to their energy:
microwaves, gamma, ultraviolet, visible light, x ray,
infrared, radiowaves!
radiowaves < microwaves < infrared < visible light <
ultraviolet < x ray < gamma
2. Define the limiting frequency (νmax) of braking radiation
at V accelerating voltage!
where h is Planck's constant and e is the charge of an
3. Is it the photoelectric or the Compton-effect during which the total energy of the X-ray photon is given to the
Photoelectric effect.
4. Align in ascending order the following transitions
according to their energy difference: vibrational,
rotational and electronic!
rotational < vibrational < electronic
5. How can the momentum of a photon be calculated?
p=h/λ; where h is Planck's constant, λ is the wavelength
of the photon.
6. What is the difference between the orbital and spin
angular momenta of an electron?
- the orbital angular momentum originates from the orbital motion of an electron; its magnitude depends on
the shape of the orbital and the interactions of the
electron with the surrounding particles.
- the spin angular momentum is an inherent property of
the electron, its magnitude is independent of the
7. What is the minimal energy of a γ-photon needed for
pair-production? (Not numerically.)
E=mc2, the energy equivalent to the rest mass of an
electron and a positron.
8. Why is a heavy nucleus necessary for pair-production?
The presence of a heavy nucleus is required by the law
of conservation of momentum
9. What is annihilation?
When a positron and an electron interact with each
other, the total mass-energy of this particle system is
converted to the energy of two gamma photons.
10. Give the three most important mechanisms responsible
for the absorption of X-rays !
- photoelectric effect
- Compton-effect
- pair-production
11. Which mechanisms are responsible for the attenuation
of X-ray passing through a material?
- absorption
- scattering.
12. What is the unit of the attenuation coefficient of