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# Sound Waves and Motion Properties

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1) Sound waves travel through an aluminum bar at a speed of 1400 m/s. If the frequency of the sound wave is 880 Hz, what is the distance between crests on a sound wave traveling through aluminum?

2) An airplane flies horizontally at a constant speed, piloted by rescuers who are searching for a disabled boat. When the plane is directly above the boat, the boat's crew blows a loud horn. By the time plane's sound detector receives the horn's sound, the plane has traveled a distance equal to one-half its altitude above the ocean. If it takes the sound 4.00s to reach the plane and, determine
a) the speed of the plane
b) and its altitude. Take the speed of sound to be 343m/s.

3) Estimate the wavelength of a 1500 Hz sound wave.

4) A clarinet acts as a closed-ended air column. If its bottom note has a frequency of 130 Hz, how long is the column?