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CHEMISTRY!!!!!!

Can anyone help me solve these problems??? Thanks

1) Calculate the characteristic wavelength of an electron traveling at 4.5E5 m/s.

2) Calculate the value of r for which a node exists in the 3p wave function of a hydrogen atom.

3) Calculate the wavelength of a photon emitted when the electron in a Li2+ ion relaxes from the n=12 energy level to the n=9 energy level. (Use Bohr's model of the atom.)

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ChanQ

Asked by ChanQ at 10:05 PM on Jan. 29, 2012 in Back To School

12089 Level 21
Answers (4)
  • 1) wavelength= Plank's constant/(mass of electron * velocity of electron)

    2) Not sure on this one have you tried googling the question.

    3) wavelength = 1/(R*[(1/Nf^2)-(1/Ni^2)])

    Nf=orbit final
    Ni=Orbit initial
    R=Rydberg's constant
    amandajoy21

    Answer by amandajoy21 at 10:23 PM on Jan. 29, 2012

    Credits: 8071 Level 19 1 star Back To School 101
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  • those were the equations that I used but when i plug them into the answer box it marks them as incorrect.
    ChanQ

    Comment by ChanQ (original poster) at 10:48 PM on Jan. 29, 2012

    Credits: 12089 Level 21 1 star Back To School 101
  • are you sure all of your units are consistent and you are using the right number of significant digits. When I took chemistry webassign was really picky about what significant digits you use.
    amandajoy21

    Answer by amandajoy21 at 10:53 PM on Jan. 29, 2012

    Credits: 8071 Level 19 1 star Back To School 101
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  • it is very possible that the answers were put in the system incorrectly - like a typo - can you email your professor and tell them your answers and say that you dont understand why they arent right - i would suppose that if you and the first repsonder got the SAME answers its one of two things - you are making the same common mistake - or the online grader is wrong.
    AmaliaD

    Answer by AmaliaD at 3:20 PM on Feb. 2, 2012

    Credits: 11679 Level 21 1 star Back To School 101
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