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Helium atom and bohr model

  • Thread starter amit25
  • Start date
  • #1
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Homework Statement



He+ ion consists of a nucleus which is an alpha particle plus one orbiting electron.Hence it has a net positive charge.
a)Derive an expression for the electron state energies
b)what is the wavelength associated with a transition between the lowest two energy states?

Homework Equations





The Attempt at a Solution


For part a) i figured it out to be E=(-4R)/(n^2) where R is the rydbergs constant
for part b) im having trouble not sure where to begin
 

Answers and Replies

  • #2
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Don't forget, the wavelength of a photon emitted, for a drop in energy level, is proportional to the difference in energies between the two levels.

I think that will be useful.
 
  • #3
30
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should i use this

ΔE = RchZ²{1/n²(1) - 1/n²(2)}

where R is the Rydberg constant (1.0974 x 10E7 m-¹); c the speed of light in vacuum (2.9979 x 10E8 m s-¹); h Planck's constant (6.626 x 10E-34 J s); Z nuclear charge; n(1) & n(2) are the principal quantum numbers of the electron transition
 

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