Maina, Ibrahim, <p>Department of Physics, Abubakar Tafawa Balewa University, PMB 0248 Bauchi, Bauchi State, Nigeria</p> Martins, Onimisi A., Department of Geology, Federal University Lokoja, Nigeria Mustapha, Idris Muhammad, <p>Department of Physics, Nasarawa State University, PMB 1022 Keffi, Nasarawa State, Nigeria</p>