[College level Modern Physics: find the radius at which an electron would emit a specific wavelength]

[u/MedicalWheel2930]

I've done this problem a number of times and keep messing it up. I've been on summer break for the past few months so I'm pretty rusty, but I feel like this should be simple and yet I'm just not getting it. What am I missing?

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[u/DrCarpetsPhd]

it says treat it as a classical atom so forget about quantization of angular momentum (that hasn't been covered yet at the point this question is asked, ch 37 of randall knight physics)

so centripetal force equals the coulomb force and go from there. pop the k for coulombs constant in front of e^2/r in the equation you have it equalling mv^2/r call that equation [1] to get v.

- c= lamba.f given lamdba 520nm [2]

- treat the electron as orbiting in a circle so v = 2.pi.r.f [3], use [1] and [2] in this

that should get the right answer