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quiz5a

# quiz5a - Exam 5A Name MULTIPLE CHOICE Choose the one...

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Exam 5A Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) If the pressure amplitude of a sound wave doubles, what happens to the decibel level? A) -9.5dB B) -5dB C) 0dB D) 5dB E) 10dB 1) 2) One end of a nylon rope is tied to a stationary support at the top of a vertical mine shaft 80m deep. At the bottom end a weight of 20kg is attached.The mass of the rope is 2kg. A geologist at the bottom of the rope signals her colleague by jerking the rope sideways. If she stimulated sinusoidal waves on the rope with frequency 2Hz, how many cycles of the wave fit in the ropes length? 2) 3) What are: A) (a)0.5 m ; (b) 0.4 Hz; (c) 10 m; (d) 2 m/s B) (a)0.8 m ; (b) 0.3 Hz; (c) 12 m; (d) 4.4 m/s C) (a) 0.5 m; (b) 3 Hz; (c) 12 m; (d) 4 m/s D) (a)0.5 m ; (b) 0.4 Hz; (c) 12m; (d) 4m/s E) (a) 0.6 m; (b) 1 Hz; (c) 12 m; (d) 9 m/s 3)

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