[b]1. The emission line of He II at 468.6 nm corresponds to what electronic transition?
[b]2. I know that the formula 1 / λ = R(1 / nb2 - 1/ na2) may be useful but I'm not sure how the Rydberg's constant would change since it's helium. Also, I'm not sure what to assume as the initial energy...
Homework Statement
Prove that the potential outside of any radially symmetric charge distribution of total charge q, given by,
V = q/(4*pi*epsilon_0*r)
is a solution to Laplace's Equation.
Hint: Only a masochist would solve this problem by solving Laplace's Equation. It is much...
I think what you've said so far is fairly correct. This also ties in with the fact that attractive forces have a negative sign associated with them, and repulsive forces are positive by convention.
Homework Statement
A complicated distribution of 10 protron produces a radially symmetric electric field given by,
E(r) = (10*charge_of_proton/4pi*epsilon_0)*(1/r^2 + 100/r^4)*r_hat
Give an order of magnitude estimate for the size of the charge distribution.
Homework Equations...