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quiz6a

# quiz6a - Exam 6a Name MULTIPLE CHOICE Choose the one...

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Exam 6a Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What is the speed of light in a material for which the critical angle with air is 61 degrees? A) 0.8c B) 0.9c C) c D) 1.1c E) 1.2c 1) 2) A shock wave is going through gas at a Mach angle of 60 degrees. We decrease the pressure in the gas by a factor 3, keeping the density and displacement amplitude the same, while the shock wave is still passing through. What's the mach angle after the pressure increase? A) 40 degrees B) 80 degrees C) 50 degrees D) 30 degrees E) 60 degrees 2) 3) Which of the following is true. A) Speed of the wave often depends on the amplitude of the wave. This is refered to as dispersion. B) Speed of a wave often depends on the frequency of the wave. This is refered to as dispersion. C) The fact that light in glass fibers decreases in intensity as it travels over large distances is a result of dispersion. D) To compose a square wave from a superposition of sine waves requires dispersion.

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quiz6a - Exam 6a Name MULTIPLE CHOICE Choose the one...

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