[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...
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...
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.