PhysicsFaculty of Science, Sana'a University Ahmed Khalid Abdul Rahim SalehAssistant Professor Muhammad Ali ShukriAssociate Professor Thana Mohammed AbdulazizAssociate Professor Ibrahim Ghalib Hamood LoqmanAssistant Professor Shakib Moqbel Ali AlsowidyAssociate Professor Mohamed Kasem Al-MotawakelAssociate Professor Sami Abdulqader Ahmed HanashAssistant Professor Fouad Abdo Ghilan MahyoubAssistant Professor Mohammed Saleh Saleh QusailahAssistant Professor Abdul Hakim Ahmed Abdul Galil Al-HammadiAssociate Professor Khaldoon Abdo Kaid Al-AziziTEACHER Abdu Ahmed H. AlkellyProfessor