"(a) Use the radial wave function for the 3p orbital of a hydrogen atom (see Table 15.2) to calculate the value of r for which a node exists. (b) Find the values of r for which nodes exist for the 3s wave function of the hydrogen atom." For part a, I looked at Table 15.2 and found the equation R3p = 4/(81*square root of 6) * (Z/a0)^(3/2) * (6*sigma - sigma2) exp (-sigma/3) where sigma = Z*r/a0 and a0 = 0.529 * 10^-10m 1. Does exp (-sigma/3) mean raise (6*sigma - sigma2) to the (-sigma/3) power? 2. What exactly does the value of R3p represent? 3. To solve this problem do I set R3p to 0 and solve for r?