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        "name": "4_5 Applications of Trigonometry to Waves",
        "intro": "<p>Waves and vibrations occur in many contexts. The water waves on the sea \nand the vibrations of a stringed musical instrument are just two \neveryday examples. If the vibrations are simple \u2018to and fro\u2018 \noscillations they are referred to as \u2018sinusoidal\u2018 &nbsp; which implies that a\n knowledge of trigonometry, particularly of the sine and cosine \nfunctions, is a necessary pre-requisite for dealing with their analysis.\n In this quiz we give a brief introduction to this topic.<br><\/p>",
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