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Physics Review Question Unit: waves Year: 1991 Question#: 50 Question: Polychromatic light passing through a glass prism is seperated into its component frequncies. This phenomenon is called: (1 ) Diffraction (2 ) Dispersion (3 ) Reflection (4 ) Polarization What is this question really asking? Explanation by: Mike M [ Return to question menu ] Answer 1 Diffraction INCORRECT This is incorrect because diffraction means the changing of direction of waves when passed through a new medium. The waves are either slowed down or sped up, but they are not broken down into their component frequencies. return to top Answer 2 Dispersion CORRECT This the correct answer because dispersion means when a wave is broken down into it's primary colors, or component frequencies. The light passes through a prism in one color (white) and comes out of the prism as it's component colors. return to top Answer 3 Reflection INCORRECT This is incorrect because reflection is when the light hits a surface and does not penetrate it. Instead, it bounces off at a supplementary angle from what came in at. return to top Answer 4 Polarization INCORRECT This is incorrect because polarization has to do with lenses. It has noting to do with different frequencies, but with different types of waves (horizontal or vertical). return to top What's this question really asking? It is really asking if I know what polychromatic and component frequencies mean. It is also checking if I understand how the different terms in the answers apply to the situation. return to top |
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