Choose the BEST answer to the following:The loudness of a

Choose the BEST answer to each of the following: You swing to and fro on a playground swing. If you stand rather than sit, the time for a to-and-fro swing is (a) lengthened. (b) shortened. (c) unchanged.

Choose the BEST answer to each of the following: The time it takes for a pendulum swinging to and fro refers to its (a) frequency. (b) period. (c) wavelength. (d) amplitude.

Choose the BEST answer to each of the following: The period of a 10-Hz wave is (a)1/10 s. (b) 1.0 s. (c) 10 s. (d) None of these.

Choose the BEST answer to each of the following: A wave transfers (a) amplitude. (b) wavelength. (c) frequency. (d) energy.

Choose the BEST answer to each of the following: Find the speed of a wave by multiplying its frequency by its (a) period. (c) amplitude. (b) wavelength. (d) None of these.

Choose the BEST answer to each of the following: The vibrations in a transverse wave move in a direction (a) along the wave. (b) perpendicular to the wave. (c) Both of these. (d) Neither of these.

Choose the BEST answer to each of the following: The vibrations in a longitudinal wave move in a direction (a) along and parallel to the wave. (b) perpendicular to the wave. (c) Both of these. (d) Neither of these.

Choose the BEST answer to each of the following: Interference is characteristic of (a) sound waves. (c) water waves. (b) light waves. (d) All of these.

Choose the BEST answer to each of the following: Standing waves are the result of (a) interference. (b) waves overlapping in phase and out of phase. (c) waves reflecting upon themselves. (d) All of these.

Choose the BEST answer to each of the following: The Doppler effect occurs when a source of sound moves (a) toward you. (b) away from you. (c) Both of these. (d) None of these.

Choose the BEST answer to each of the following: Compared with the sound you hear from the siren of a stationary fire engine, its sound when it approaches you has an increased (a) speed. (c) Both of these. (b) frequency. (d) Neither of these.

Choose the BEST answer to each of the following: Bow waves are produced by waves of water (a) overlapping one another. (b) constructively interfering. (c) moving slower than the source producing them. (d) All of these.

Choose the BEST answer to each of the following: Shock waves are produced by waves of sound (a) overlapping one another. (b) constructively interfering. (c) moving slower than the source producing them. (d) All of these.

Choose the BEST answer to each of the following: During the time an aircraft produces a sonic boom, the aircraft is (a) breaking the sound barrier. (b) pulling out of a subsonic dive. (c) flying faster than sound. (d) All of these.

Choose the BEST answer to each of the following: The sound waves that most humans cannot hear are (a) infrasonic. (b) ultrasonic. (c) Both of these. (d) Neither of these.

Choose the BEST answer to each of the following: Sound travels in air by a series of (a) compressions. (b) rarefactions. (c) Both of these. (d) Neither of these.

Choose the BEST answer to each of the following: The compressions and rarefactions in sound normally travel (a) in the same direction. (b) in opposite directions. (c) at right angles to each other. (d) None of these.

Choose the BEST answer to each of the following: Sound travels in (a) solids. (b) liquids. (c) gases. (d) All of these.

Choose the BEST answer to each of the following: Sound will travel fastest in (a) a steel beam. (c) ocean water. (b) a wooden plank. (d) air in a balloon.

Choose the BEST answer to each of the following: The speed of sound is slightly greater on a (a) cold day. (c) day with steady temperature. (b) hot day. (d) None of these.

Choose the BEST answer to each of the following: The loudness of a sound is most closely related to its (a) frequency. (b) period. (c) wavelength. (d) amplitude.

Choose the BEST answer to each of the following: Your friend states that, under all conditions, any radio wave travels faster than any sound wave. You (a) agree with your friend. (b) disagree with your friend.

Choose the BEST answer to each of the following: When you tap a piece of wood, it will produce a characteristic sound related to its (a) wavelength. (c) period. (b) amplitude. (d) natural frequency.

Choose the BEST answer to each of the following: When an object is set vibrating by a wave that has a matching frequency, what occurs is (a) forced vibration. (b) resonance. (c) refraction. (d) amplitude reduction.

Choose the BEST answer to each of the following: Noise-canceling devices make use of sound (a) destruction. (c) resonance. (b) interference. (d) amplification.

Choose the BEST answer to each of the following: The phenomenon of beats is the result of sound (a) destruction. (c) resonance. (b) interference. (d) amplification.

Choose the BEST answer to each of the following: A 1134-Hz tuning fork is sounded at the same time a piano note is struck. You hear three beats per second. The frequency of the piano string is (a) 1131 Hz. (b) 1134 Hz. (c) 1137 Hz. (d) More information is needed.

Choose the BEST answer to each of the following: The pitch of a sound is mostly related to its (a) intensity. (b) frequency. (c) amplitude. (d) speed.

Choose the BEST answer to each of the following: Compared with a sound of 60 decibels, a sound of 80 decibels has an intensity (a) 10 times greater. (b) 100 times greater. (c) 1000 times greater. (d) more than 1000 times greater.

Choose the BEST answer to each of the following: Compared with a fundamental tone, the frequency of its second harmonic is (a) half as much. (b) twice as much. (c) the same. (d) four times as much.