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P6 ­ The Wave Model of Radiation ­ Answers
1. Waves are vibrations that transfer energy from place to place without matter (solid, liquid or gas) being
transferred.
2. In transverse waves, the vibrations are at right angles to the direction of travel. Light and other types of
electromagnetic radiation…

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densities, such as air and glass. This causes them to change direction and this effect is called refraction.
11. Beyond a certain angle, called the critical angle, all the waves reflect back into the glass. We say that they are
totally internally reflected. All light waves, which hit the surface…

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