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21. 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. 40 degrees. D. 90 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 11/19/2015 1:44:38 PM
Updated 11/19/2015 2:00:04 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 11/19/2015 2:00:04 PM
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Confirmed by yumdrea [11/19/2015 7:57:06 PM]
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Updated 8/2/2019 12:59:08 AM
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If a gas has a gauge pressure of 156 kPa, its absolute pressure is approximately 256 kpa.

Solution:
Absolute pressure= GP + AP = 100 + 156 is 256 kpa.
Added 8/2/2019 12:59:08 AM
This answer has been confirmed as correct and helpful.
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