Submitted on: 12 September 2022.
Revised on: 24 December 2022.
Accepted on: 12 January 2023.
___________________EUROPEAN JOURNAL OF PHYSICS---IOP PUBLISHING LTD
http://reply.papertrans.cn/1/93/9254/9254-32.png
http://reply.papertrans.cn/1/93/9254/9254-33.png
http://reply.papertrans.cn/1/93/9254/9254-34.png
Submitted on: 23 April 2010.
Revised on: 12 June 2010.
Accepted on: 05 July 2010.
___________________EUROPEAN JOURNAL OF PHYSICS---IOP PUBLISHING LTD
Submitted on: 20 November 2009.
Revised on: 22 December 2009.
Accepted on: 18 January 2010.
___________________EUROPEAN JOURNAL OF PHYSICS---IOP PUBLISHING LTD