1. The problem statement, all variables and given/known data Consider an electron in the n = 5, ℓ = 2, mℓ = -1 state. What is the probability that the electron is located in a cone of half angle 41◦ about the z axis? (In other words, what is the probability that θ ≤ 41◦ ?) 2. Relevant equations P=∫∫∫R(r)^2 * Y[θ,phi]^2 3. The attempt at a solution I'm not quite sure what I'm doing here, but this is as far as I got: I said R(r) is a constant because the angle doesn't depend on the radius. Next I found an expression for Y(theta,phi) from my textbook based on l and m_l: Y(θ,f)=.5*sqrt(15/2pi)SinθCosθ * e^-i*f I integrated Y^2, .7156<θ<pi, 0<f<pi This probability is not right. ANy ideas?