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Homework Help: Having trouble finding some of the defintions in book

  1. May 9, 2009 #1
    define the following
    are these definitions correct?
    and i can't find some of them in the book

    1. Lorentz contraction equation

    2. the selection rules for dipole radiation

    3.the energies of the electron in hydrogen

    4. 4 quantum numbers for hydrogen

    5. the equation relating the parent-daughter nuclei in alpha decay

    6. the equation relating the parent-daughter nuclei in beta decay

    7. the relationship between halflife and the disintegration constant

    8. how big is a nuclues?

    9. what is the reason for energy bands in solids?

    10. how many states are there in a s-band?

    11. how many states are there in a p-band?

    12. the energy of a harmonic oscillator


    13. the energies of a particle in a 1-D box of length, L

    14. define phase velocity

    15.define group velocity

    help would be appreciated, I know how to apply them. Thanks
  2. jcsd
  3. May 9, 2009 #2
    answer to #4 would be n=2, l=0 ml=0 and ms=+-1/2
  4. May 9, 2009 #3


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    Homework Helper

    Try other books. You should also get lots of information just using Google. See what you can find.

    You know how to apply them, but you don't know what they are? I'm not sure I understand what you mean.
  5. May 9, 2009 #4
    what exactly is an energy band. I am really confused.
    From my reading i get that each s-band can only have one state correct?
    and the p-band would be able to have 2 states?
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