For the hydrogen-atom ground state, (a) find V; (b) use the results of (a) and 6.35 to

Question:

For the hydrogen-atom ground state, (a) find 〈V〉; (b) use the results of (a) and 6.35 to find 〈T〉; then find 〈T〉 > 〈V〉; (c) use 〈T〉 to calculate the root-mean-square speed 〈v2〉1/2 of the electron; then find the numerical value of 〈v2〉1/2/c, where c is the speed of light.