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TAMU PHYS 1401 - Module 6 unit test

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Module #6 – Unit TestPhysics 1401 Question 1Which one of the following statements concerning waves is false?Select one:A. A transverse wave is one in which the disturbance is parallel to the direction of travel. B. A wave carries energy from one place to another.C. A wave can have both transverse and longitudinal components.D. A wave is a traveling disturbance.E. A wave does not result in the bulk flow of the material of its medium.Question 2Which one of the following waves is purely longitudinal?Select one:A. surface waves in a shallow pan of waterB. sound waves in air C. waves on a plucked violin stringD. microwaves traveling through airE. radio waves traveling through vacuumQuestion 3A wave moves at a constant speed along a string. Which one of the following statements is false concerning the motion of particles in the string?Select one:A. The particle speed is constant. B. The particle speed depends on the amplitude of the periodic motion of the source.C. The particle speed is not the same as the wave speed.D. The particle speed depends on the frequency of the periodic motion of the source.E. The particle speed is independent of the tension and linear density of the string.Question 4A bell is ringing inside of a sealed glass jar that is connected to a vacuum pump. Initially, the jar is filled with air. What does one hear as the air is slowly removed from the jar by the pump?Select one:A. The speed of the sound from the bell gradually increases.B. The sound intensity from the bell gradually decreases. C. The intensity of the sound from the bell does not change.D. The frequency of the sound from the bell gradually increases.E. The frequency of the sound from the bell gradually decreases.Question 5The decibel level of a jackhammer is 125 dB relative to the threshold of hearing. Determine the sound intensity produced by the jackhammer.Select one:A. 1.0 W/m2B. 88 W/m2C. 4.8 W/m2D. 12 W/m2E. 3.2 W/m2 Question 6A car moving at 35 m/s approaches a stationary whistle that emits a 220 Hz sound. The speed of sound is 343 m/s. What is the frequency of sound heard by the driver of the car?Select one:A. 245 Hz B. 198 HzC. 340 HzD. 282 HzE. 220 HzQuestion 7Sound waves are emitted from two speakers. Which one of the following statements about sound wave interference is false?Select one:A. Interference redistributes the energy carried by the individual waves.B. Destructive interference occurs when two waves are exactly out of phase when they meet.C. In a region where both destructive and constructive interference occur, energy is not conserved. D. Constructive interference occurs when two waves are exactly in phase when they meet.E. Sound waves undergo diffraction as they exit each speaker.Question 8Which one of the following superpositions will result in beats?Select one:A. the superposition of identical waves that travel in the same directionB. the superposition of waves that travel with different speedsC. the superposition of identical waves that travel in opposite directionsD. the superposition of waves that are identical except for slightly different frequencies E. the superposition of waves that are identical except for slightly different amplitudesQuestion 9A 93.0 kg skydiver hanging from a parachute bounces up and down with a period of 1.50s. What is the new period of oscillation when a second skydiver, whose mass is 64.0 kg, hangs from the legs of the first?Answer:1.95Question 10How many times a minute does a boat bob up and down on ocean waves that have a wavelength of 37.0 m and a propagation speed of 5.10 m/s?Answer:8.27Question 11What sound level in dB is produced by earphones that create an intensity of 7.50 X 10-2 W/m2?Answer:109Question 12What is the smallest beat frequency result if a piano hammer hits three strings that emit frequencies of 127.4, 127.9, and 128.7 Hz?


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TAMU PHYS 1401 - Module 6 unit test

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