For the system described in Exercise 7B.3(a), what is the probability of finding the light atom in the volume element d at =? Data

For the system described in Exercise 7B.3(a), what is the probability of finding the light atom in the volume element dφ at φ =π?

Data in Exercise 7B.3(a)

An unnormalized wavefunction for a light atom rotating around a heavy atom to which it is bonded is ψ(φ)=e^iφ with 0 ≤ φ ≤ 2π. Normalize this wavefunction.