Volume 6 Number 2 Apr - Jun 2017 STUDENT JOURNAL OF PHYSICS INTERNATIONAL EDITION INDIAN ASSOCIATION OF PHYSICS TEACHERS ISSN – 2319-3166 STUDENT JOURNAL OF PHYSICS EDITORIAL BOARD INTERNATIONAL ADVISORY BOARD Editor in Chief H.S. Mani, CMI, Chennai, India (
[email protected]) L. Satpathy, Institute of Physics, Bhubaneswar, India S. M. Moszkowski, UCLA, USA (
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[email protected]) Jogesh C. Pati, SLAC, Stanford, USA (
[email protected]) Satya Prakash, Panjab University, Chandigarh, India Chief Editors (
[email protected]) S. D. Mahanti, Physics and Astronomy Department, T.V. Ramakrishnan, BHU, Varanasi, India Michigan State University, East Lansing, Mi 48824, USA (
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[email protected]) G. Rajasekaran, The Institute of Mathematical Sciences, A.M. Srivastava, Institute of Physics, Bhubaneswar, India Chennai, India (
[email protected]) (
[email protected]) Ashoke Sen, HRI, Allahabad, India (
[email protected]) X. Vinas, Departament d’Estructura i Constituents de la Mat`eria and Institut de Ci`encies del Cosmos, Facultat de F INTERNATIONAL EDITORIAL BOARD ´ısica, Universitat de Barcelona, Barcelona, Spain Danny Caballero, Department of Physics, Michigan State (
[email protected]) University, U.S.A. (
[email protected]) Gerd Kortemeyer, Joint Professor in Physics & Lyman Briggs College, Michigan State University, U.S.A. Technical Editor (
[email protected]) D. Pradhan, ILS, Bhubaneswar, India Bedanga Das Mohanty, NISER, Bhubaneswar, India (
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[email protected]) Prasanta Panigrahi, IISER, Kolkata, India (
[email protected]) Web Management K.C. Ajith Prasad, Mahatma Gandhi College, Aditya Prasad Ghosh, IOP, Bhubaneswar, India Thiruvananthapuram, India (
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[email protected]) Ralph Scheicher, Physics Department, University of Uppsala, Sweden (
[email protected]) Vijay A.