FinalPractice-298Sp08 - Exam...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) If the frequency of a violin string is to be increased by 20%, what change in tension must be applied? A) 4.5% B) 20% C) 44% D) 10% 1) 2) A wire, 8.0 m long, with a mass of 10 g, is under tension. A transverse wave is propagated on the wire, for which the frequency is 570 Hz, the wavelength is 0.10 m, and the amplitude is 3.7 mm. The maximum transverse acceleration, of a point on a wire, in SI units, is closest to: A) 29,000 B) 35,000 C) 47,000 D) 41,000 E) 53,000 2) 3) A wave on a stretched string is described by y = 0.004 sin (300t - 15x). What is the maximum velocity of a particle on the string? A) 1.20 m/s B) 8.37 x 10 - 5 m/s C) 0.060 m/s D) 5.56 m/s E) 20.0 m/s 3) 4) Transverse waves propagate at 43.2 m/s in a string that is subjected to a tension of 60.5 N. If the string is 19.0 m long, what is its mass? A) 0.259 kg B) 0.437 kg C) 0.715 kg D) 0.616 kg 4) TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 5) If a rocket is traveling toward a mountain at 1/2 the speed of sound, the sound waves from this rocket's engine approach the mountain at 1 1/2 times the speed of sound. 5) 6) A wave pulse moves along a uniform string. The speed of this wave is constant but the speed of the particles of the string changes with time. 6) 7) A guitar string is Fxed at both ends. If you tighten it to increase its tension, the frequencies of its normal modes will increase but its wavelengths will not be affected. 7) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 8) Which of the following increases when a sound becomes louder? A) amplitude B) wavelength C) velocity D) period E) frequency 8) 1
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9) Which of the following is a FALSE statement? A) Waves transport energy and matter from one region to another. B) A wave in which particles move back and forth in the same direction as the wave is moving is called a longitudinal wave. C) Not all waves are mechanical in nature. D) The speed of a wave and the speed of the vibrating particles that constitute the wave are different entities. E) In a transverse wave the particle motion is perpendicular to the velocity vector of the wave. 9) 10) When a guitar is tuned, what is it that is changed? A) The frequency of the fundamental. B) The amplitude of the fundamental. C) The wavelength of the fundamental. D) The phase of the fundamental. E) More than one of the above. 10) 11) Consider the waves on a vibrating guitar string and the sound waves the guitar produces in the surrounding air. The string waves and the sound waves have the same A) velocity. B) amplitude.
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