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**1. Homework Statement**

a) Consider a hydrogenic atom consisting of a carbon-12

nucleus and a single electron. What is the wavelength of the

photon emitted when this atom drops from n = 5 to the n = 2

state?

b) According to the Bohr theory, what is the distance

between the electron and the nucleus in the n = 2 state of the

hydrogenic carbon-12 atom?

**2. Homework Equations**

[itex]r_n = n^2 \times a_0[/itex]

where [itex]a_0[/itex] is the bohr radius

**3. The Attempt at a Solution**

I found the answer to part A no problem, but b is giving me trouble.

I know that the equation for the radius for excited states is for a hydrogen atom. WIth a carbon nucleus I expect it to be much smaller that the bohr radius, but I can't figure out how to account for the change in nucleus size.

Any ideas?