ChE 361 #5

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Author:
deshayes
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53053
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ChE 361 #5
Updated:
2010-12-03 02:29:14
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Engineering materials final
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  1. What material repels an external magnetic field?
    Diamagnetic
  2. Materials that, when exposed to an external magnetic field, non-magnetic atoms acquire temporary magnetic moments that tend to oppose the external field?
    Diamagnetic
  3. Material that, an external magnetic field causes randomly oriented magnetic atoms to align temporarily in the same direction as the field.
    Paramagnetic
  4. Material that is weakly attracted to an external magnetic field but cannot be magnetized permanently.
    Paramagnetic
  5. Which property is related to the resistance of a material to demagnetization?
    Coercive field
  6. Referring to the equation B=mu0(H+M), how is M related to H for a linear magnetic material?
    M=xmH
  7. Material that can be magnetized but will not conduct electricity.
    Diamagnetic
  8. What happens at the Curie temperature of a ferromagnetic material?
    Saturation magnetization disappears
  9. What is a Bohr magneton?
    Magnetic moment of an unpaired electron
  10. Iron is a ferromagnetic material, but not all pieces of iron are permanent magnets. Why?
    Magnetic domains cancel the external field
  11. Which property is proportional to the energy loss in a transformer?
    Area inside hysteresis loop
  12. Which property is related to the stength of a permanent magnet's B-field?
    Remanence
  13. Which property determines whether a magnetic material is considered "hard" or "soft"?
    Coercive field
  14. Light falling on the interface between two media
    Incident light
  15. Mirror-like reflection at a smooth interface between two media
    Specular reflection
  16. Reflection at a rough interface between two media
    Diffuse reflection
  17. Bending of light as it passes through the interface between two media
    Refraction
  18. Crystal defect inside medium where light is deflected
    Scattering center
  19. Place where light is converted to heat inside a medium
    Absorption center
  20. Which equation gives the reflectivity at small angles of incidence?
    R=((n2-n1)/(n2+n1))2
  21. Which equation describes the refraction of light?
    n1sin(theta1)=n2sin(theta2)
  22. Which equation is the law of reflection?
    theta1=theta2
  23. Which equation allows us to estimate the refractive index of a dielectric from its electric and magnetic properties?
    c=1/(emu)1/2
  24. Which equation defines the absorption coefficient?
    I=I0exp(-beta*x)

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