examthreeanswers - Physical Science 1 Exam Three Name:_...

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Physical Science 1 Name:__________________________________ Exam Three MULTIPLE CHOICE. Circle the one alternative that best completes the statement or answers the question. Each question is worth five points. 1) A floating leaf oscillates up and down two complete cycles each second as a water wave passes by. What is the wave's frequency? A) 2 Hz B) 1 Hz C) 6 Hz D) 3 Hz E) 0.5 Hz Recall that frequency is defined as cycles per second. If the leaf bobs two complete cycles each second, its frequency is 2 Hz. The answer is A. 2) A Doppler effect occurs when a source of sound moves A) at right angles to you. B) toward you. C) both of these D) none of these The Doppler effect is when the wavelength shortens as waves from an object moving toward you reach you. Similarly, when the object is moving away from you, the waves get farther apart. The answer is B. 3) A skipper on a boat notices wave crests passing the anchor chain every 5 s. The skipper estimates the distance between crests is 15 m. What is the speed of the water waves? A) 3 m/s B) 15 m/s C) 5 m/s D) not enough information given The period of the waves is 5 seconds, so the frequency is 1/5 = 0.2 Hz. The wavelength is 15 m. The product of wavelength and frequency is the wave speed, so 0.2 x 15 = 3 m/s. The answer is A. 4)
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This note was uploaded on 11/18/2010 for the course CPHY 101 taught by Professor Jay during the Fall '10 term at University of Massachusetts Boston.

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examthreeanswers - Physical Science 1 Exam Three Name:_...

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