During the process of steel production, the flaws in steel casting are detected by A. infrasonic vibrations. B. resonant vibrations. C. ultrasonic vibrations. D. longitudinal vibrations.

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During the process of steel production, the flaws in steel casting are detected by ultrasonic vibrations.

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Asked 2/23/2016 11:48:36 PM

Updated 2/24/2016 1:34:41 AM

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Question|Asked by bellemortexx

Updated 2/24/2016 1:25:44 AM

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If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is A. 80 degrees. B. 40 degrees. C. 0 degrees. D. 90 degrees.

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Updated 2/24/2016 12:02:14 AM

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matahari

If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is 40 degrees.

Added 2/24/2016 12:02:14 AM

This answer has been confirmed as correct and helpful.

Confirmed by yumdrea [2/24/2016 12:03:59 AM]

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