11. If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is A. 0 degrees. B. 80 degrees. C. 90 degrees. D. 40 degrees.
If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is 40 degrees.
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Question
Updated 12/4/2015 8:07:57 PM
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If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is 40 degrees.
Confirmed by yumdrea [12/4/2015 8:15:54 PM]

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Updated 12/1/2015 1:46:31 AM
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Confirmed by selymi [12/1/2015 1:46:39 AM]
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12. Increasing your vocabulary means A. you'll write more lively sentences. B. you'll spend less time on revision. C. you'll be able to spend more time reading. D. you'll write longer sentences.
Question
Updated 12/1/2015 9:55:37 PM
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Confirmed by selymi [12/2/2015 5:54:15 AM]
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Updated 12/1/2015 9:21:35 PM
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