Module 6 Unit Test Physics 1401 Question 1 Which 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 2 Which one of the following waves is purely longitudinal Select one A surface waves in a shallow pan of water B sound waves in air C waves on a plucked violin string D microwaves traveling through air E radio waves traveling through vacuum Question 3 A 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 4 A 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 5 The 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 m2 B 88 W m2 C 4 8 W m2 D 12 W m2 E 3 2 W m2 Question 6 A 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 Hz C 340 Hz D 282 Hz E 220 Hz Question 7 Sound 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 8 Which one of the following superpositions will result in beats Select one A the superposition of identical waves that travel in the same direction B the superposition of waves that travel with different speeds C the superposition of identical waves that travel in opposite directions D the superposition of waves that are identical except for slightly different frequencies E the superposition of waves that are identical except for slightly different amplitudes Question 9 A 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 95 Question 10 How 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 27 Question 11 What sound level in dB is produced by earphones that create an intensity of 7 50 X 10 2 W m2 Answer 109 Question 12 What 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 Answer 0 5
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