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20. If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is A. 90 degrees. B. 0 degrees. C. 80 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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Asked 3/18/2014 9:06:46 AM
Updated 1/1/2017 9:53:17 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.
Added 1/1/2017 9:53:17 PM
This answer has been confirmed as correct and helpful.
Confirmed by Andrew. [1/1/2017 11:27:45 PM]
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19. A temperature of 200°F is equivalent to approximately A. 37.8°C. B. 93.3°C. C. 840°C. D. 232°C.
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Updated 3/18/2014 9:13:31 AM
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Added 3/18/2014 9:13:31 AM
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Updated 10/13/2015 11:45:56 AM
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The INTENSITY of a sound wave is defined as the amount of energy passing through a unit area of the wave front in a unit of time.
Added 10/13/2015 10:26:51 AM
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Confirmed by yumdrea [10/13/2015 10:37:15 AM]
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