Sound wave by Heba Soffar · Published September 2, 2014 · Updated June 11, 2015 The level of the sound intensity changes from one person to another .
0 Visible spectrum and Properties of light October 2, 2017 by Heba Soffar · Published October 2, 2017 · Last modified September 7, 2019
0 Rescue robots (Mobile robots) types, uses, advantages and disadvantages December 21, 2018 by Heba Soffar · Published December 21, 2018 · Last modified August 30, 2019
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