April 9th, 2018 - Last Updated On December 8 2017 Below Are The Answers Key For The Multiple Choice Questions In Radiation And Wave Propagation – MCQs Part 1 … A medium is a different reference frame to vacuum, so the difference in the observed speed of light is a consequence of relativity. The propagation speed of sound through soft tissue is. Find out here. Electron oscillators in the medium introduce a phase change upon re-radiation. b 1650 ms −1. Test your understanding of Electromagnetic radiation concepts with Study.com's quick multiple choice quizzes. This is the Multiples Choice Questions Part 5 of the Series in Radiation and Wave Propagation as one of the Communications Engineering topic. MCQ Biology - Learning Biology through MCQs. a 1450 ms −1. Propagation in media depends on re-radiation by electron-oscillators, which takes a finite time to occur. 1 m – 10 m b. 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