Lesson: Chapter 4 — Waves and their applications

4.1. Mechanical waves 2 of 4 Reset answers

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Question 2

Which of these is not a mechanical wave?

A Light from the sun B A wave on a guitar string C A wave on the surface of water D Sound in air

The right answer is the one marked above.

Light from the sun. Light is an electromagnetic wave and reaches us across empty space, so it needs no material medium.

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